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In [[mathematical finance]], the '''Greeks''' are the quantities representing the sensitivity of the price of [[derivative (finance)|derivatives]] such as [[option (finance)|options]] to a change in underlying [[parameter]]s on which the value of an instrument or [[Portfolio (finance)|portfolio]] of [[financial instrument]]s is dependent. The name is used because the most common of these sensitivities are often denoted by [[Greek alphabet|Greek letters]]. Collectively these have also been called the '''risk sensitivities''',<ref>{{Cite book|last1= Banks |first1= Erik |last2= Siegel |first2= Paul |title= The options applications handbook: hedging and speculating techniques for professional investors |publisher= [[McGraw-Hill Professional]] |page= 263 |year= 2006 |isbn= 9780071453158 |quote= ISBN 0-07-145315-6}}</ref> '''risk measures'''<ref name="macmillan93">{{Cite book|last= Macmillan |first= Lawrence G. |title= Options as a Strategic Investment |publisher= [[New York Institute of Finance]] |edition= 3rd |year= 1993 |isbn= 978-0-13-636002-5 |quote= ISBN 0-13-099661-0 }}</ref>{{rp|742}} or '''hedge parameters'''.<ref>{{Cite book|last= Chriss |first= Neil |title= Black–Scholes and beyond: option pricing models |publisher= [[McGraw-Hill Professional]] |page= 308 |year= 1996 |isbn= 9780786310258 |quote= ISBN 0-7863-1025-1}}</ref> | |||
== Use of the Greeks == | |||
{| border="1" cellspacing="0" cellpadding="1" style="float:right; width:320px;" | |||
| | |||
{| border="0" cellspacing="1" cellpadding="1" style="width:100%;" | |||
! !! style="vertical-align:bottom;"| ''Spot<br />Price (S)'' !! style="vertical-align:bottom;"| ''Volatility<br />(<math>\sigma</math>)'' !! style="vertical-align:bottom;"| ''Time to<br />Expiry (<math>\tau</math>)'' | |||
|- | |||
! style="text-align:right;"| ''Value (V) '' | |||
| style="background:#8ebded; text-align:center;"|<math>\Delta</math> [[Greeks (finance)#Delta|Delta]] | |||
| style="background:#8ebded; text-align:center;"|<math>\nu</math> [[Greeks (finance)#Vega|Vega]] | |||
| style="background:#8ebded; text-align:center;"|<math>\Theta</math> [[Greeks (finance)#Theta|Theta]] | |||
|- | |||
! || || || || | |||
|- | |||
! style="text-align:right;"| ''Delta (<math>\Delta</math>) '' | |||
| style="background:#90ee90; text-align:center;"|<math>\Gamma</math> [[Greeks (finance)#Gamma|Gamma]] | |||
| style="background:#90ee90; text-align:center;"| [[Greeks (finance)#Vanna|Vanna]] | |||
| style="background:#90ee90; text-align:center;"| [[Greeks (finance)#Charm|Charm]] | |||
|- | |||
! style="text-align:right;"| ''Vega (<math>\nu</math>) '' | |||
| style="background:#90ee90; text-align:center;"| [[Greeks (finance)#Vanna|Vanna]] | |||
| style="background:#90ee90; text-align:center;"| [[Greeks (finance)#Vomma|Vomma]] | |||
| style="background:#90ee90; text-align:center;"| [[Greeks (finance)#Veta|Veta]] | |||
|- | |||
! || || || || | |||
|- | |||
! style="text-align:right;"| ''Gamma (<math>\Gamma</math>) '' | |||
| style="background:#eded8e; text-align:center;"| [[Greeks (finance)#Speed|Speed]] | |||
| style="background:#eded8e; text-align:center;"| [[Greeks (finance)#Zomma|Zomma]] | |||
| style="background:#eded8e; text-align:center;"| [[Greeks (finance)#Color|Color]] | |||
|- | |||
! style="text-align:right;"| ''Vomma '' | |||
| style="background:#eded8e; text-align:center;"| | |||
| style="background:#eded8e; text-align:center;"| [[#Ultima|Ultima]] | |||
| style="background:#eded8e; text-align:center;"| [[Greeks (finance)#Totto|Totto]] | |||
|- | |||
! || || || | |||
|} | |||
|- | |||
| | |||
{| border="0" cellspacing="0" cellpadding="4" | |||
|Definition of Greeks as the sensitivity of an option's price and risk (in the first column) to the underlying parameter (in the first row). First-order Greeks are in blue, second-order Greeks are in green, and third-order Greeks are in yellow. Note that vanna appears twice as it should, and rho is left out as it is not as important as the rest. | |||
|} | |||
|} | |||
The Greeks are vital tools in [[Financial risk management|risk management]]. Each Greek measures the [[partial derivative|sensitivity]] of the value of a portfolio to a small change in a given underlying parameter, so that component risks may be treated in isolation, and the portfolio rebalanced accordingly to achieve a desired exposure; see for example [[delta hedging]]. | |||
The Greeks in the [[Black–Scholes model]] are relatively easy to calculate, a desirable property of [[financial market|financial]] [[Model (economics)|models]], and are very useful for derivatives traders, especially those who seek to hedge their portfolios from adverse changes in market conditions. For this reason, those Greeks which are particularly useful for hedging delta, theta, and vega are well-defined for measuring changes in Price, Time and Volatility. Although rho is a primary input into the Black–Scholes model, the overall impact on the value of an option corresponding to changes in the [[risk-free interest rate]] is generally insignificant and therefore higher-order derivatives involving the risk-free interest rate are not common. | |||
The most common of the Greeks are the first order derivatives: [[Greeks (finance)#Delta|Delta]], [[Greeks (finance)#Vega|Vega]], [[Greeks (finance)#Theta|Theta]] and [[Greeks (finance)#Rho|Rho]] as well as [[Greeks (finance)#Gamma|Gamma]], a second-order derivative of the value function. The remaining sensitivities in this list are common enough that they have common names, but this list is by no means exhaustive. | |||
== First-order Greeks == | |||
=== Delta === | |||
{| style="float:right;" | |||
|<math>\Delta = \frac{\partial V}{\partial S}</math> | |||
|} | |||
'''[[delta (letter)|Delta]]''',<ref name="autogenerated2007">{{Cite book | |||
|last= Haug | |||
|first= Espen Gaardner | |||
|author-link = Espen Gaarder Haug | |||
|title= The Complete Guide to Option Pricing Formulas | |||
|publisher= [[McGraw-Hill Professional]] | |||
|year= 2007 | |||
|isbn= 9780071389976 |quote= ISBN 0-07-138997-0 | |||
}}</ref> <math>\Delta</math>, measures the rate of change of option value with respect to changes in the underlying asset's price. Delta is the [[partial derivative|first derivative]] of the value <math>V</math> of the option with respect to the underlying instrument's price <math>S</math>. | |||
====Practical use==== | |||
For a vanilla option, delta will be a number between 0.0 and 1.0 for a long [[Call option|call]] (or a short put) and 0.0 and −1.0 for a long [[Put option|put]] (or a short call); depending on price, a call option behaves as if one owns 1 share of the underlying stock (if deep in the money), or owns nothing (if far out of the money), or something in between, and conversely for a put option. The difference of the delta of a call and the delta of a put at the same strike is close to but not in general equal to one, but instead is equal to the inverse of the discount factor. By [[put–call parity]], long a call and short a put equals a forward ''F'', which is linear in the spot ''S,'' with factor the inverse of the discount factor, so the derivative dF/dS is this factor. | |||
These numbers are commonly presented as a percentage of the total number of shares represented by the option contract(s). This is convenient because the option will (instantaneously) behave like the number of shares indicated by the delta. For example, if a portfolio of 100 American call options on XYZ each have a delta of 0.25 (=25%), it will gain or lose value just like 25 shares of XYZ as the price changes for small price movements. The sign and percentage are often dropped – the sign is implicit in the option type (negative for put, positive for call) and the percentage is understood. The most commonly quoted are 25 delta put, 50 delta put/50 delta call, and 25 delta call. 50 Delta put and 50 Delta call are not quite identical, due to spot and forward differing by the discount factor, but they are often conflated. | |||
Delta is always positive for long calls and negative for long puts (unless they are zero). The total delta of a complex portfolio of positions on the same underlying asset can be calculated by simply taking the sum of the deltas for each individual position – delta of a portfolio is linear in the constituents. Since the delta of underlying asset is always 1.0, the trader could [[Delta neutral|delta-hedge]] his entire position in the underlying by buying or shorting the number of shares indicated by the total delta. For example, if the delta of a portfolio of options in XYZ (expressed as shares of the underlying) is +2.75, the trader would be able to delta-hedge the portfolio by [[short (finance)|selling short]] 2.75 shares of the underlying. This portfolio will then retain its total value regardless of which direction the price of XYZ moves. (Albeit for only small movements of the underlying, a short amount of time and not-withstanding changes in other market conditions such as volatility and the rate of return for a risk-free investment). | |||
====As a proxy for probability==== | |||
{{main|Moneyness}} | |||
The (absolute value of) Delta is close to, but not identical with, the percent [[moneyness]] of an option, i.e., the ''implied'' probability that the option will expire [[in-the-money]] (if the market moves under [[Brownian motion]] in the [[risk-neutral measure]]).<ref>{{cite web|title=Options Greeks: Delta Risk and Reward |last=Suma |first=John |url=http://www.investopedia.com/university/option-greeks/greeks2.asp |accessdate=7 Jan 2010}}</ref> For this reason some option traders use the absolute value of delta as an approximation for percent moneyness. For example, if an [[out-of-the-money]] call option has a delta of 0.15, the trader might estimate that the option has approximately a 15% chance of expiring in-the-money. Similarly, if a put contract has a delta of −0.25, the trader might expect the option to have a 25% probability of expiring in-the-money. [[At-the-money]] puts and calls have a delta of approximately 0.5 and −0.5 respectively with a slight bias towards higher deltas for ATM calls,<ref group="note">There is a slight bias for a greater probability that a call will expire in-the-money than a put at the same strike when the underlying is also exactly at the strike. This bias is due to the much larger range of prices that the underlying could be within at expiration for calls (Strike...+inf) than puts (0...Strike). However, with large strike and underlying values, this asymmetry can be effectively eliminated. Yet the "bias" to the call remains (ATM delta > 0.50) due to the expected value of the lognormal distribution (namely, the (1/2)''σ''<sup>2</sup> term). Also, in markets that exhibit contango forward prices (positive basis), the effect of interest rates on forward prices will also cause the call delta to increase.{{Citation needed|date=April 2010}}</ref> i.e. both have approximately a 50% chance of expiring in-the-money. The correct, exact calculation for the probability of an option finishing at a particular price of K is its [[Dual Delta]], which is the first derivative of option price with respect to strike.{{citation needed|date=July 2012}} | |||
====Relationship between call and put delta==== | |||
Given a European call and put option for the same underlying, strike price and time to maturity, and with no dividend yield, the sum of the absolute values of the delta of each option will be 1.00 – more precisely, the delta of the call (positive) minus the delta of the put (negative) equals 1. This is due to [[put–call parity]]: a long call plus a short put (a call minus a put) replicates a forward, which has delta equal to 1. | |||
If the value of delta for an option is known, one can compute the value of the delta of the option of the same strike price, underlying and maturity but opposite right by subtracting 1 from the known value. For example, if the delta of a call is 0.42 then one can compute the delta of the corresponding put at the same strike price by 0.42 − 1 = −0.58. Deriving the delta of a call from put will not follow this approach. If the delta of a put is −0.58 and we follow the same approach, then delta of a call with the same strike would be −1.58. Instead, delta should be equal to the opposite sign, i.e.: (abs(delta)-1). | |||
=== Vega === | |||
{| style="float:right;" | |||
|<math>\nu=\frac{\partial V}{\partial \sigma}</math> | |||
|} | |||
'''Vega'''<ref name="autogenerated2007"/> measures sensitivity to [[volatility (finance)|volatility]]. Vega is the derivative of the option value with respect to the [[volatility (finance)|volatility]] of the underlying asset. | |||
''Vega'' is not the name of any Greek letter. However, the glyph used is the Greek letter [[Nu (letter)|nu]] (<math>\nu</math>). Presumably the name ''vega'' was adopted because the Greek letter ''nu'' looked like a Latin ''vee'', and ''vega'' was derived from ''vee'' by analogy with how ''beta'', ''eta'', and ''theta'' are pronounced in American English. Another possibility is that it is named after Joseph De La Vega, famous for ''Confusion of Confusions'', a book about stock markets and which discusses trading operations that were complex, involving both options and forward trades.<ref>{{cite web|title=Joseph de la Vega|url=http://www.qfinance.com/capital-markets-thinkers/joseph-de-la-vega|publisher=QFinance|accessdate=1 July 2013}}</ref> | |||
The symbol '''[[kappa]]''', <math>\kappa</math>, is sometimes used (by academics) instead of '''vega''' (as is '''tau''' (<math>\tau</math>) | |||
or capital Lambda (<math>\Lambda</math>)<ref name="Hull93">{{Cite book | |||
|last= Hull | |||
|first= John C. | |||
|title= Options, Futures, and Other Derivative Securities | |||
|publisher= [[Prentice-Hall]] | |||
|edition= 2nd | |||
|year= 1993 | |||
|isbn= 9780136390145 | |||
|quote= ISBN 0-13-639014-5 | |||
}}</ref>{{rp|315}}, | |||
though these are rare). | |||
Vega is typically expressed as the amount of money per underlying share that the option's value will gain or lose as volatility rises or falls by 1%. | |||
Vega can be an important Greek to monitor for an option trader, especially in volatile markets, since the value of some option strategies can be particularly sensitive to changes in volatility. The value of an [[Straddle|option straddle]], for example, is extremely dependent on changes to volatility. | |||
=== Theta === | |||
{| style="float:right;" | |||
|<math>\Theta = -\frac{\partial V}{\partial \tau}</math> | |||
|} | |||
'''[[theta (letter)|Theta]]''',<ref name="autogenerated2007"/> '''<math>\Theta</math>''', measures the sensitivity of the value of the derivative to the passage of time (see [[Option time value]]): the "time decay." | |||
The mathematical result of the formula for theta (see below) is expressed in value per year. By convention, it is usual to divide the result by the number of days in a year, to arrive at the amount of money per share of the underlying that the option loses in one day. Theta is almost always negative for long calls and puts and positive for short (or written) calls and puts. An exception is a deep in-the-money European put. The total theta for a portfolio of options can be determined by summing the thetas for each individual position. | |||
The value of an option can be analysed into two parts: the [[intrinsic value (finance)|intrinsic value]] and the time value. The intrinsic value is the amount of money you would gain if you exercised the option immediately, so a call with strike $50 on a stock with price $60 would have intrinsic value of $10, whereas the corresponding put would have zero intrinsic value. The time value is the value of having the option of waiting longer before deciding to exercise. Even a deeply [[out of the money]] put will be worth something, as there is some chance the stock price will fall below the strike before the expiry date. However, as time approaches maturity, there is less chance of this happening, so the time value of an option is decreasing with time. Thus if you are long an option you are short theta: your portfolio will lose value with the passage of time (all other factors held constant). | |||
=== Rho === | |||
{| style="float:right;" | |||
|<math>\rho = \frac{\partial V}{\partial r}</math> | |||
|} | |||
'''[[rho (letter)|Rho]]''',<ref name="autogenerated2007"/> <math>\rho</math>, measures sensitivity to the interest rate: it is the derivative of the option value with respect to the risk free interest rate (for the relevant outstanding term). | |||
Except under extreme circumstances, the value of an option is less sensitive to changes in the risk free interest rate than to changes in other parameters. For this reason, rho is the least used of the first-order Greeks. | |||
Rho is typically expressed as the amount of money, per share of the underlying, that the value of the option will gain or lose as the risk free interest rate rises or falls by 1.0% per annum (100 basis points). | |||
=== Lambda === | |||
{| style="float:right;" | |||
|<math>\lambda = \frac{\partial V}{\partial S}\times\frac{S}{V}</math> | |||
|} | |||
'''[[Lambda]]''', '''<math>\lambda</math>''', '''[[omega]]''', <math>\Omega</math>, or '''elasticity'''<ref name="autogenerated2007"/> is the [[percentage]] change in option value per [[percentage]] change in the underlying price, a measure of [[Leverage (finance)|leverage]], sometimes called [[Gearing (finance)|gearing]]. | |||
== Second-order Greeks == | |||
{{anchor|Gamma}} | |||
=== Gamma === | |||
{| style="float:right;" | |||
|<math>\Gamma = \frac{\partial \Delta}{\partial S} = \frac{\partial^2 V}{\partial S^2}</math> | |||
|} | |||
'''[[gamma (letter)|Gamma]]''',<ref name="autogenerated2007"/> <math>\Gamma</math>, measures the rate of change in the delta with respect to changes in the underlying price. Gamma is the second [[derivative]] of the value function with respect to the underlying price. All long options have positive gamma and all short options have negative gamma. Gamma is greatest approximately at-the-money (ATM) and diminishes the further out you go either in-the-money (ITM) or out-of-the-money (OTM). Gamma is important because it corrects for the [[Convexity (finance)|convexity]] of value. | |||
When a trader seeks to establish an effective delta-hedge for a portfolio, the trader may also seek to neutralize the portfolio's gamma, as this will ensure that the hedge will be effective over a wider range of underlying price movements. However, in neutralizing the gamma of a portfolio, alpha (the return in excess of the risk-free rate) is reduced. | |||
=== Vanna === | |||
{| style="float:right;" | |||
|<math>\text{Vanna} | |||
= \frac{\partial \Delta}{\partial \sigma} | |||
= \frac{\partial \nu}{\partial S} | |||
= \frac{\partial^2 V}{\partial S \partial \sigma} | |||
</math> | |||
|} | |||
'''Vanna''',<ref name="autogenerated2007"/> also referred to as '''DvegaDspot''' and '''DdeltaDvol''', | |||
<ref name="kyw1"> | |||
{{Citation | |||
| last = Haug | |||
| first = Espen Gaarder | |||
| author-link = Espen Gaarder Haug | |||
| title = Know Your Weapon, Part 1 | |||
| journal = Wilmott Magazine | |||
| issue = May 2003 | |||
| pages = 49–57 | |||
| year = 2003 | |||
| url = http://www.espenhaug.com/KnowYourWeapon.pdf | |||
}}</ref> | |||
is a second order derivative of the option value, once to the underlying spot price and once to volatility. It is mathematically equivalent to '''DdeltaDvol''', the sensitivity of the option delta with respect to change in volatility; or alternatively, the partial of vega with respect to the underlying instrument's price. Vanna can be a useful sensitivity to monitor when maintaining a delta- or vega-hedged portfolio as vanna will help the trader to anticipate changes to the effectiveness of a delta-hedge as volatility changes or the effectiveness of a vega-hedge against change in the underlying spot price. | |||
===Vomma=== | |||
{| style="float:right;" | |||
|<math>\text{Vomma} = \frac{\partial \nu}{\partial \sigma} = \frac{\partial^2 V}{\partial \sigma^2}</math> | |||
|} | |||
'''Vomma''', '''Volga''', '''Vega Convexity''',<ref name="kyw2"> | |||
{{Citation | |||
| last = Haug | |||
| first = Espen Gaarder | |||
| author-link = Espen Gaarder Haug | |||
| title = Know Your Weapon, Part 2 | |||
| journal = Wilmott Magazine | |||
| issue = July 2003 | |||
| pages = 43–57 | |||
| year = 2003 | |||
}}</ref> '''Vega gamma''' or '''dTau/dVol''' measures second order sensitivity to [[Volatility (finance)|volatility]]. Vomma is the second derivative of the option value with respect to the volatility, or, stated another way, vomma measures the rate of change to vega as volatility changes. With positive vomma, a position will become long vega as [[implied volatility]] increases and short vega as it decreases, which can be scalped in a way analogous to long gamma. And an initially vega-neutral, long-vomma position can be constructed from ratios of options at different strikes. Vomma is positive for options away from the money, and initially increases with distance from the money (but drops off as vega drops off). (Specifically, vomma is positive where the usual d1 and d2 terms are of the same sign, which is true when d2 < 0 or d1 > 0.) | |||
===Charm=== | |||
{| style="float:right;" | |||
| <math>\text{Charm} =- \frac{\partial \Delta}{\partial \tau} = \frac{\partial \Theta}{\partial S} = -\frac{\partial^2 V}{\partial S \, \partial \tau}</math> | |||
|} | |||
'''Charm'''<ref name="autogenerated2007"/> or '''delta decay''', measures the instantaneous rate of change of delta over the passage of time. Charm has also been called '''DdeltaDtime'''.<ref name="kyw1"/> Charm can be an important Greek to measure/monitor when delta-hedging a position over a weekend. Charm is a second-order derivative of the option value, once to price and once to the passage of time. It is also then the derivative of [[Greeks (finance)#Theta|theta]] with respect to the underlying's price. | |||
The mathematical result of the formula for charm (see below) is expressed in delta/year. It is often useful to divide this by the number of days per year to arrive at the delta decay per day. This use is fairly accurate when the number of days remaining until option expiration is large. When an option nears expiration, charm itself may change quickly, rendering full day estimates of delta decay inaccurate. | |||
===Veta=== | |||
{| style="float:right;" | |||
|<math>\frac{\partial \nu}{\partial \tau} = \frac{\partial^2 V}{\partial \sigma \, \partial \tau}</math> | |||
|} | |||
'''Veta''', or '''DvegaDtime''',<ref name="kyw2"/> measures the rate of change in the vega with respect to the passage of time. Veta is the second derivative of the value function; once to volatility and once to time. | |||
It is common practice to divide the mathematical result of veta by 100 times the number of days per year to reduce the value to the percentage change in vega per one day. | |||
===Vera=== | |||
{| style="float:right;" | |||
|<math>\frac{\partial \rho}{\partial \sigma} = \frac{\partial^2 V}{\partial \sigma \, \partial r}</math> | |||
|} | |||
'''Vera''' (sometimes '''Rhova''') measures the rate of change in rho with respect to volatility. Vera is the second derivative of the value function; once to volatility and once to interest rate. | |||
Vera can be used to assess the impact of volatility change on rho-hedging. | |||
== Third-order Greeks == | |||
=== Color === | |||
{| style="float:right;" | |||
|<math>\text{Color} = \frac{\partial \Gamma}{\partial \tau} = \frac{\partial^3 V}{\partial S^2 \, \partial \tau}</math> | |||
|} | |||
'''Color''',<ref group=note> | |||
This author has only seen this referred to in the British spelling "Colour", but has written it here in the US spelling to match the style of the existing article. | |||
</ref> '''gamma decay''' or '''DgammaDtime'''<ref name="kyw1"/> measures the rate of change of gamma over the passage of time. Color is a third-order derivative of the option value, twice to underlying asset price and once to time. Color can be an important sensitivity to monitor when maintaining a gamma-hedged portfolio as it can help the trader to anticipate the effectiveness of the hedge as time passes. | |||
The mathematical result of the formula for color (see below) is expressed in gamma/year. It is often useful to divide this by the number of days per year to arrive at the change in gamma per day. This use is fairly accurate when the number of days remaining until option expiration is large. When an option nears expiration, color itself may change quickly, rendering full day estimates of gamma change inaccurate. | |||
===Speed=== | |||
{| style="float:right;" | |||
|<math>\text{Speed} = \frac{\partial\Gamma}{\partial S} = \frac{\partial^3 V}{\partial S^3}</math> | |||
|} | |||
'''Speed'''<ref name="autogenerated2007"/> measures the rate of change in Gamma with respect to changes in the underlying price. This is also sometimes referred to as '''the gamma of the gamma'''<ref name="macmillan93"/>{{rp|799}} or '''DgammaDspot'''.<ref name="kyw1"/> '''Speed''' is the third derivative of the value function with respect to the underlying spot price. Speed can be important to monitor when [[Delta hedging|delta-hedging]] or gamma-hedging a portfolio. | |||
===Ultima=== | |||
{| style="float:right;" | |||
|<math>\text{Ultima}= \frac{\partial \text{vomma}}{\partial \sigma} = \frac{\partial^3 V}{\partial \sigma^3}</math> | |||
|} | |||
'''Ultima'''<ref name="autogenerated2007"/> measures the sensitivity of the option vomma with respect to change in volatility. Ultima has also been referred to as '''DvommaDvol'''.<ref name="autogenerated2007"/> Ultima is a third-order derivative of the option value to volatility. | |||
===Zomma=== | |||
{| style="float:right;" | |||
| <math>\text{Zomma} = \frac{\partial \Gamma}{\partial \sigma} = \frac{\partial \text{vanna}}{\partial S} = \frac{\partial^3 V}{\partial S^2 \, \partial \sigma}</math> | |||
|} | |||
'''Zomma'''<ref name="autogenerated2007"/> measures the rate of change of gamma with respect to changes in volatility. Zomma has also been referred to as '''DgammaDvol'''.<ref name="kyw1"/> Zomma is the third derivative of the option value, twice to underlying asset price and once to volatility. Zomma can be a useful sensitivity to monitor when maintaining a gamma-hedged portfolio as zomma will help the trader to anticipate changes to the effectiveness of the hedge as volatility changes. | |||
== Greeks for multi-asset options == | |||
If the value of a derivative is dependent on two or more [[underlying]]s, its Greeks are extended to include the cross-effects between the underlyings. | |||
'''Correlation delta''' measures the sensitivity of the derivative's value to a change in the correlation between the underlyings.{{citation needed|date=February 2012}} | |||
'''Cross gamma''' measures the rate of change of delta in one underlying to a change in the level of another underlying. | |||
<ref name="mao1">{{cite web | |||
| last=Fengler | |||
| first=Matthias | |||
| last2=Schwendner | |||
| first2=Peter | |||
| title=Correlation Risk Premia for Multi-Asset Equity Options | |||
| url=http://edoc.hu-berlin.de/series/sfb-373-papers/2003-10/PDF/10.pdf | |||
}}</ref> | |||
'''Cross vanna''' measures the rate of change of vega in one underlying due to a change in the level of another underlying. Equivalently, it measures the rate of change of delta in the second underlying due to a change in the volatility of the first underlying.{{citation needed|date=February 2012}} | |||
'''Cross volga''' measures the rate of change of vega in one underlying to a change in the volatility of another underlying.<ref name="mao1"/> | |||
== Formulas for European option Greeks == | |||
{{See also|Black–Scholes model}} | |||
The Greeks of European options ([[call option|calls]] and [[put option|puts]]) under the [[Black–Scholes model]] are calculated as follows, where <math>\phi</math> (phi) is the [[standard normal]] [[probability density function]] and <math>\Phi</math> is the [[standard normal]] [[cumulative distribution function]]. Note that the gamma and vega formulas are the same for calls and puts. | |||
For a given: | |||
Stock Price <math> S \, </math>, | |||
Strike Price <math> K \, </math>, | |||
Risk-Free Rate <math> r \, </math>, | |||
Annual Dividend Yield <math> q \, </math>, | |||
Time to Maturity <math> \tau = T-t \, </math>, and | |||
Volatility <math> \sigma \, </math>... | |||
{| border="1" cellspacing="0" cellpadding="10" | |||
|- | |||
! !! Calls !! Puts | |||
|- | |||
! value || <math> Se^{-q \tau}\Phi(d_1) - e^{-r \tau} K\Phi(d_2) \, </math> || <math> e^{-r \tau} K\Phi(-d_2) - Se^{-q \tau}\Phi(-d_1) \, </math> | |||
|- | |||
! colspan="3" | | |||
|- | |||
! delta || <math> e^{-q \tau} \Phi(d_1) \, </math> || <math> -e^{-q \tau} \Phi(-d_1)\, </math> | |||
|- | |||
! vega || colspan="2"| <math> S e^{-q \tau} \phi(d_1) \sqrt{\tau} = K e^{-r \tau} \phi(d_2) \sqrt{\tau} \, </math> | |||
|- | |||
! theta || <math> -e^{-q \tau} \frac{S \phi(d_1) \sigma}{2 \sqrt{\tau}} - rKe^{-r \tau}\Phi(d_2) + qSe^{-q \tau}\Phi(d_1) \, </math> || <math> -e^{-q \tau} \frac{S \Phi(d_1) \sigma}{2 \sqrt{\tau}} + rKe^{-r \tau}\Phi(-d_2) - qSe^{-q \tau}\Phi(-d_1)\, </math> | |||
|- | |||
! rho || <math> K \tau e^{-r \tau}\Phi(d_2)\, </math> || <math> -K \tau e^{-r \tau}\Phi(-d_2) \, </math> | |||
|- | |||
! colspan="3" | | |||
|- | |||
! gamma || colspan="2"| <math> e^{-q \tau} \frac{\phi(d_1)}{S\sigma\sqrt{\tau}} \, </math> | |||
|- | |||
! vanna ||colspan="2"| <math> -e^{-q \tau} \phi(d_1) \frac{d_2}{\sigma} \, = \frac{\nu}{S}\left[1 - \frac{d_1}{\sigma\sqrt{\tau}} \right]\, </math> | |||
|- | |||
! charm || <math> qe^{-q \tau} \Phi(d_1) - e^{-q \tau} \phi(d_1) \frac{2(r-q) \tau - d_2 \sigma \sqrt{\tau}}{2\tau \sigma \sqrt{\tau}} \, </math> || <math> -qe^{-q \tau} \Phi(-d_1) - e^{-q \tau} \phi(d_1) \frac{2(r-q) \tau - d_2 \sigma \sqrt{\tau}}{2\tau \sigma \sqrt{\tau}} \, </math> | |||
|- | |||
! colspan="3" | | |||
|- | |||
! speed ||colspan="2"| <math> -e^{-q \tau} \frac{\phi(d_1)}{S^2 \sigma \sqrt{\tau}} \left(\frac{d_1}{\sigma \sqrt{\tau}} + 1\right) = -\frac{\Gamma}{S}\left(\frac{d_1}{\sigma\sqrt{\tau}}+1\right) \, </math> | |||
|- | |||
! zomma || colspan="2" | <math>e^{-q \tau} \frac{\phi(d_1)\left(d_1 d_2 - 1\right)}{S\sigma^2\sqrt{\tau}} = \Gamma\cdot\left(\frac{d_1 d_2 -1}{\sigma}\right) \, </math> | |||
|- | |||
! color ||colspan="2"| <math> -e^{-q \tau} \frac{\phi(d_1)}{2S\tau \sigma \sqrt{\tau}} \left[2q\tau + 1 + \frac{2(r-q) \tau - d_2 \sigma \sqrt{\tau}}{\sigma \sqrt{\tau}}d_1 \right] \, </math> | |||
|- | |||
! colspan="3" | | |||
|- | |||
! veta || colspan="2" | <math>Se^{-q \tau} \phi(d_1) \sqrt{\tau} \left[ q + \frac{ \left( r - q \right) d_1 }{ \sigma \sqrt{\tau} } - \frac{1 + d_1 d_2}{2 \tau} \right] \,</math> | |||
|- | |||
! vomma ||colspan="2"| <math> Se^{-q \tau} \phi(d_1) \sqrt{\tau} \frac{d_1 d_2}{\sigma} = \nu \frac{d_1 d_2}{\sigma} \, </math> | |||
|- | |||
! Ultima ||colspan="2"| <math>\frac{-\nu}{\sigma^2} \left[ d_1 d_2 (1 - d_1 d_2) + d_1^2 + d_2^2 \right]</math> | |||
|- | |||
! colspan="3" | | |||
|- | |||
! dual delta || <math> -e^{-r \tau} \Phi(d_2) \, </math> || <math> e^{-r \tau} \Phi(-d_2) \, </math> | |||
|- | |||
! dual gamma ||colspan="2"| <math> e^{-r \tau} \frac{\phi(d_2)}{K\sigma\sqrt{\tau}} \, </math> | |||
|} | |||
where | |||
:<math> d_1 = \frac{\ln(S/K) + (r - q + \sigma^2/2)\tau}{\sigma\sqrt{\tau}} </math> | |||
:<math> d_2 = \frac{\ln(S/K) + (r - q - \sigma^2/2)\tau}{\sigma\sqrt{\tau}} = d_1 - \sigma\sqrt{\tau} </math> | |||
:<math> \phi(x) = \frac{e^{- \frac{x^2}{2}}}{\sqrt{2 \pi}} </math> | |||
:<math> \Phi(x) = \frac{1}{\sqrt{2\pi }} \int_{-\infty}^x e^{- \frac{y^2}{2}} \,dy =1- \frac{1}{\sqrt{2\pi }} \int_{x}^\infty e^{- \frac{y^2}{2}} \,dy</math> | |||
== Related measures == | |||
Some related risk measures of financial derivatives are listed below. | |||
===Bond duration and convexity=== | |||
{{main|Bond duration|Bond convexity}} | |||
In trading of fixed income securities (bonds), various measures of [[bond duration]] are used analogously to the delta of an option. The closest analogue to the delta is [[DV01]], which is the reduction in price (in currency units) for an increase of one [[basis point]] (i.e. 0.01% per annum) in the yield (the yield is the underlying variable). | |||
Analogous to the lambda is the [[modified duration]], which is the ''percentage'' change in the market price of the bond(s) for a ''unit'' change in the yield (i.e. it is equivalent to DV01 divided by the market price). Unlike the lambda, which is an [[Elasticity (economics)|elasticity]] (a percentage change in output for a percentage change in input), the modified duration is instead a [[semi-elasticity|''semi''-elasticity]]—a percentage change in output for a ''unit'' change in input. | |||
[[Bond convexity]] is a measure of the sensitivity of the duration to changes in [[interest rate]]s, the [[second derivative]] of the price of the bond with respect to interest rates (duration is the first derivative). In general, the higher the convexity, the more sensitive the bond price is to the change in interest rates. Bond convexity is one of the most basic and widely used forms of [[Convexity (finance)|convexity in finance]]. | |||
===Beta=== | |||
{{main|Beta (finance)}} | |||
The '''Beta''' (β) of a [[stock]] or [[Portfolio (finance)|portfolio]] is a number describing the volatility of an asset in relation to the volatility of the benchmark that said asset is being compared to. This benchmark is generally the overall financial market and is often estimated via the use of representative [[index (finance)|indices]], such as the [[S&P 500]]. | |||
An asset has a Beta of zero if its returns change independently of changes in the market's returns. A positive beta means that the asset's returns generally follow the market's returns, in the sense that they both tend to be above their respective averages together, or both tend to be below their respective averages together. A negative beta means that the asset's returns generally move opposite the market's returns: one will tend to be above its average when the other is below its average. | |||
===Fugit=== | |||
{{main|Fugit}} | |||
The [[fugit]] is the expected time to exercise an American or Bermudan option. It is useful to compute it for hedging purposes—for example, one can represent flows of an American swaption like the flows of a swap starting at the fugit multiplied by delta, then use these to compute sensitivities. | |||
==See also== | |||
* [[Alpha (finance)]] | |||
* [[Beta coefficient]] | |||
* [[Delta neutral]] | |||
* [[Greek letters used in mathematics]] | |||
==Notes== | |||
{{Reflist|group=note}} | |||
==References== | |||
{{Reflist}} | |||
==External links== | |||
'''Discussion''' | |||
* [http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1012075 Why We Have Never Used the Black-Scholes-Merton Option Pricing Formula], [[Nassim Taleb]] and [[Espen Gaarder Haug]] | |||
'''Theory''' | |||
* Delta, Gamma, GammaP, Gamma symmetry, Vanna, Speed, Charm, Saddle Gamma: [http://www.espenhaug.com/KnowYourWeapon.pdf Vanilla Options - Espen Haug], | |||
* Volga, Vanna, Speed, Charm, Color: [http://www.mathfinance.de/FXRiskBook/chap-1.pdf Vanilla Options - Uwe Wystup], [http://www.institute.mathfinance.de/PraktikumFinanzmathematik/library/vanilla_fxoptions.pdf Vanilla Options - Uwe Wystup] | |||
'''Online tools''' | |||
* [http://cdmurray80.googlepages.com/optiongreeks Surface Plots of Black-Scholes Greeks], Chris Murray | |||
* [http://www.cba.ua.edu/~rpascala/greeks/NBOPMForm.php Online real-time option prices and Greeks calculator when the underlying is normally distributed], Razvan Pascalau, Univ. of Alabama | |||
* [http://www.edupristine.com/blog/greeks Excel-based tool to calculate the Greeks] - A free excel sheet provided by Pristine | |||
{{Derivatives market}} | |||
{{DEFAULTSORT:Greeks (Finance)}} | |||
[[Category:Financial ratios]] |
Revision as of 12:54, 25 November 2013
In mathematical finance, the Greeks are the quantities representing the sensitivity of the price of derivatives such as options to a change in underlying parameters on which the value of an instrument or portfolio of financial instruments is dependent. The name is used because the most common of these sensitivities are often denoted by Greek letters. Collectively these have also been called the risk sensitivities,[1] risk measures[2]Primarily based on the most recent URA personal property value index (PPPI) flash estimates, we know that the PPPI, which represents the overall real property price development, has dipped in 2013Q4. That is the first dip the market has seen within the final 2 years.
To give you some perspective, the entire number of personal properties in Singapore (together with govt condominiums) is 297,689 in 2013Q3. Primarily based on the projection that there will be 19,302 units accomplished in 2014, the rise in residential models works out to be more than 6%. With a lot New Ec Launch Singapore provide, buyers might be spoilt for alternative and this in flip will lead to their reluctance to pay a premium for potential models. The complete textual content of the Copyright Act (Cap sixty three) and different statutes regarding IPR might be found on the Singapore Statutes Online Website online The Group's income jumped forty.1 p.c to $324.5 million from $231.6 million in FY 2013, lifted by increased development income and sales of growth properties in Singapore and China. Actual Estate Shopping for
One factor we've on this nation is a big group of "economists," and "market analysts." What's interesting about this group of real property market-watchers is that there are two very other ways wherein they predict Boomers will affect housing markets over the subsequent decade. Let's check out those two opposites and see how every can change the best way real property investors strategy their markets. The good news is that actual property buyers are prepared for either state of affairs, and there's profit in being ready. I'm excited and searching ahead to the alternatives both or each of these conditions will supply; thank you Boomers! Mapletree to further broaden past Asia Why fortune will favour the brave in Asia's closing real property frontier
The story of the 23.2 home begins with a stack of Douglas fir beams salvaged from varied demolished warehouses owned by the consumer's household for a number of generations. Design and structure innovator Omer Arbel, configured them to type a triangulated roof, which makes up one of the placing features of the home. The transient from the entrepreneur-proprietor was not solely to design a house that integrates antique wood beams, however one which erases the excellence between inside and exterior. Built on a gentle slope on a large rural acreage surrounded by two masses of previous-development forests, the indoors movement seamlessly to the outdoors and, from the within looking, one enjoys unobstructed views of the existing natural panorama which is preserved
First, there are typically extra rental transactions than gross sales transactions, to permit AV to be decided for each property primarily based on comparable properties. Second, movements in sale costs are more unstable than leases. Hence, utilizing rental transactions to derive the AV helps to maintain property tax more steady for property homeowners. If you're buying or trying to lease a property. It's tiring to call up individual property agent, organize appointments, coordinate timing and to go for particular person property viewing. What most individuals do is to have a property agent representing them who will arrange and coordinate the viewings for all the properties out there based mostly on your necessities & most well-liked timing. Rent Property District 12 Rent Property District thirteen
The Annual Worth of a property is mostly derived based mostly on the estimated annual hire that it may well fetch if it have been rented out. In determining the Annual Worth of a property, IRAS will think about the leases of similar properties within the vicinity, dimension and condition of the property, and different relevant components. The Annual Worth of a property is determined in the identical method regardless of whether the property is let-out, proprietor-occupied or vacant. The Annual Worth of land is determined at 5% of the market price of the land. When a constructing is demolished, the Annual Worth of the land is assessed by this method. Property Tax on Residential Properties Buyer Stamp Responsibility on Buy of Properties – Business and residential properties Rent House District 01
Within the event the Bank's valuation is decrease than the acquisition price, the purchaser has to pay the distinction between the purchase value and the Bank's valuation utilizing money. As such, the money required up-front might be increased so it's at all times essential to know the valuation of the property before making any offer. Appoint Lawyer The Bank will prepare for a proper valuation of the property by way of physical inspection The completion statement will present you the balance of the acquisition price that you must pay after deducting any deposit, pro-rated property tax and utility costs, upkeep prices, and different relevant expenses in addition to any fees payable to the agent and the lawyer. Stamp Responsibility Primarily based on the Purchase Price or Market Value, whichever is larger or hedge parameters.[3]
Use of the Greeks
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The Greeks are vital tools in risk management. Each Greek measures the sensitivity of the value of a portfolio to a small change in a given underlying parameter, so that component risks may be treated in isolation, and the portfolio rebalanced accordingly to achieve a desired exposure; see for example delta hedging.
The Greeks in the Black–Scholes model are relatively easy to calculate, a desirable property of financial models, and are very useful for derivatives traders, especially those who seek to hedge their portfolios from adverse changes in market conditions. For this reason, those Greeks which are particularly useful for hedging delta, theta, and vega are well-defined for measuring changes in Price, Time and Volatility. Although rho is a primary input into the Black–Scholes model, the overall impact on the value of an option corresponding to changes in the risk-free interest rate is generally insignificant and therefore higher-order derivatives involving the risk-free interest rate are not common.
The most common of the Greeks are the first order derivatives: Delta, Vega, Theta and Rho as well as Gamma, a second-order derivative of the value function. The remaining sensitivities in this list are common enough that they have common names, but this list is by no means exhaustive.
First-order Greeks
Delta
Delta,[4] , measures the rate of change of option value with respect to changes in the underlying asset's price. Delta is the first derivative of the value of the option with respect to the underlying instrument's price .
Practical use
For a vanilla option, delta will be a number between 0.0 and 1.0 for a long call (or a short put) and 0.0 and −1.0 for a long put (or a short call); depending on price, a call option behaves as if one owns 1 share of the underlying stock (if deep in the money), or owns nothing (if far out of the money), or something in between, and conversely for a put option. The difference of the delta of a call and the delta of a put at the same strike is close to but not in general equal to one, but instead is equal to the inverse of the discount factor. By put–call parity, long a call and short a put equals a forward F, which is linear in the spot S, with factor the inverse of the discount factor, so the derivative dF/dS is this factor.
These numbers are commonly presented as a percentage of the total number of shares represented by the option contract(s). This is convenient because the option will (instantaneously) behave like the number of shares indicated by the delta. For example, if a portfolio of 100 American call options on XYZ each have a delta of 0.25 (=25%), it will gain or lose value just like 25 shares of XYZ as the price changes for small price movements. The sign and percentage are often dropped – the sign is implicit in the option type (negative for put, positive for call) and the percentage is understood. The most commonly quoted are 25 delta put, 50 delta put/50 delta call, and 25 delta call. 50 Delta put and 50 Delta call are not quite identical, due to spot and forward differing by the discount factor, but they are often conflated.
Delta is always positive for long calls and negative for long puts (unless they are zero). The total delta of a complex portfolio of positions on the same underlying asset can be calculated by simply taking the sum of the deltas for each individual position – delta of a portfolio is linear in the constituents. Since the delta of underlying asset is always 1.0, the trader could delta-hedge his entire position in the underlying by buying or shorting the number of shares indicated by the total delta. For example, if the delta of a portfolio of options in XYZ (expressed as shares of the underlying) is +2.75, the trader would be able to delta-hedge the portfolio by selling short 2.75 shares of the underlying. This portfolio will then retain its total value regardless of which direction the price of XYZ moves. (Albeit for only small movements of the underlying, a short amount of time and not-withstanding changes in other market conditions such as volatility and the rate of return for a risk-free investment).
As a proxy for probability
Mining Engineer (Excluding Oil ) Truman from Alma, loves to spend time knotting, largest property developers in singapore developers in singapore and stamp collecting. Recently had a family visit to Urnes Stave Church. The (absolute value of) Delta is close to, but not identical with, the percent moneyness of an option, i.e., the implied probability that the option will expire in-the-money (if the market moves under Brownian motion in the risk-neutral measure).[5] For this reason some option traders use the absolute value of delta as an approximation for percent moneyness. For example, if an out-of-the-money call option has a delta of 0.15, the trader might estimate that the option has approximately a 15% chance of expiring in-the-money. Similarly, if a put contract has a delta of −0.25, the trader might expect the option to have a 25% probability of expiring in-the-money. At-the-money puts and calls have a delta of approximately 0.5 and −0.5 respectively with a slight bias towards higher deltas for ATM calls,[note 1] i.e. both have approximately a 50% chance of expiring in-the-money. The correct, exact calculation for the probability of an option finishing at a particular price of K is its Dual Delta, which is the first derivative of option price with respect to strike.Potter or Ceramic Artist Truman Bedell from Rexton, has interests which include ceramics, best property developers in singapore developers in singapore and scrabble. Was especially enthused after visiting Alejandro de Humboldt National Park.
Relationship between call and put delta
Given a European call and put option for the same underlying, strike price and time to maturity, and with no dividend yield, the sum of the absolute values of the delta of each option will be 1.00 – more precisely, the delta of the call (positive) minus the delta of the put (negative) equals 1. This is due to put–call parity: a long call plus a short put (a call minus a put) replicates a forward, which has delta equal to 1.
If the value of delta for an option is known, one can compute the value of the delta of the option of the same strike price, underlying and maturity but opposite right by subtracting 1 from the known value. For example, if the delta of a call is 0.42 then one can compute the delta of the corresponding put at the same strike price by 0.42 − 1 = −0.58. Deriving the delta of a call from put will not follow this approach. If the delta of a put is −0.58 and we follow the same approach, then delta of a call with the same strike would be −1.58. Instead, delta should be equal to the opposite sign, i.e.: (abs(delta)-1).
Vega
Vega[4] measures sensitivity to volatility. Vega is the derivative of the option value with respect to the volatility of the underlying asset.
Vega is not the name of any Greek letter. However, the glyph used is the Greek letter nu (). Presumably the name vega was adopted because the Greek letter nu looked like a Latin vee, and vega was derived from vee by analogy with how beta, eta, and theta are pronounced in American English. Another possibility is that it is named after Joseph De La Vega, famous for Confusion of Confusions, a book about stock markets and which discusses trading operations that were complex, involving both options and forward trades.[6]
The symbol kappa, , is sometimes used (by academics) instead of vega (as is tau ()
or capital Lambda ()[7]Primarily based on the most recent URA personal property value index (PPPI) flash estimates, we know that the PPPI, which represents the overall real property price development, has dipped in 2013Q4. That is the first dip the market has seen within the final 2 years.
To give you some perspective, the entire number of personal properties in Singapore (together with govt condominiums) is 297,689 in 2013Q3. Primarily based on the projection that there will be 19,302 units accomplished in 2014, the rise in residential models works out to be more than 6%. With a lot New Ec Launch Singapore provide, buyers might be spoilt for alternative and this in flip will lead to their reluctance to pay a premium for potential models. The complete textual content of the Copyright Act (Cap sixty three) and different statutes regarding IPR might be found on the Singapore Statutes Online Website online The Group's income jumped forty.1 p.c to $324.5 million from $231.6 million in FY 2013, lifted by increased development income and sales of growth properties in Singapore and China. Actual Estate Shopping for
One factor we've on this nation is a big group of "economists," and "market analysts." What's interesting about this group of real property market-watchers is that there are two very other ways wherein they predict Boomers will affect housing markets over the subsequent decade. Let's check out those two opposites and see how every can change the best way real property investors strategy their markets. The good news is that actual property buyers are prepared for either state of affairs, and there's profit in being ready. I'm excited and searching ahead to the alternatives both or each of these conditions will supply; thank you Boomers! Mapletree to further broaden past Asia Why fortune will favour the brave in Asia's closing real property frontier
The story of the 23.2 home begins with a stack of Douglas fir beams salvaged from varied demolished warehouses owned by the consumer's household for a number of generations. Design and structure innovator Omer Arbel, configured them to type a triangulated roof, which makes up one of the placing features of the home. The transient from the entrepreneur-proprietor was not solely to design a house that integrates antique wood beams, however one which erases the excellence between inside and exterior. Built on a gentle slope on a large rural acreage surrounded by two masses of previous-development forests, the indoors movement seamlessly to the outdoors and, from the within looking, one enjoys unobstructed views of the existing natural panorama which is preserved
First, there are typically extra rental transactions than gross sales transactions, to permit AV to be decided for each property primarily based on comparable properties. Second, movements in sale costs are more unstable than leases. Hence, utilizing rental transactions to derive the AV helps to maintain property tax more steady for property homeowners. If you're buying or trying to lease a property. It's tiring to call up individual property agent, organize appointments, coordinate timing and to go for particular person property viewing. What most individuals do is to have a property agent representing them who will arrange and coordinate the viewings for all the properties out there based mostly on your necessities & most well-liked timing. Rent Property District 12 Rent Property District thirteen
The Annual Worth of a property is mostly derived based mostly on the estimated annual hire that it may well fetch if it have been rented out. In determining the Annual Worth of a property, IRAS will think about the leases of similar properties within the vicinity, dimension and condition of the property, and different relevant components. The Annual Worth of a property is determined in the identical method regardless of whether the property is let-out, proprietor-occupied or vacant. The Annual Worth of land is determined at 5% of the market price of the land. When a constructing is demolished, the Annual Worth of the land is assessed by this method. Property Tax on Residential Properties Buyer Stamp Responsibility on Buy of Properties – Business and residential properties Rent House District 01
Within the event the Bank's valuation is decrease than the acquisition price, the purchaser has to pay the distinction between the purchase value and the Bank's valuation utilizing money. As such, the money required up-front might be increased so it's at all times essential to know the valuation of the property before making any offer. Appoint Lawyer The Bank will prepare for a proper valuation of the property by way of physical inspection The completion statement will present you the balance of the acquisition price that you must pay after deducting any deposit, pro-rated property tax and utility costs, upkeep prices, and different relevant expenses in addition to any fees payable to the agent and the lawyer. Stamp Responsibility Primarily based on the Purchase Price or Market Value, whichever is larger,
though these are rare).
Vega is typically expressed as the amount of money per underlying share that the option's value will gain or lose as volatility rises or falls by 1%.
Vega can be an important Greek to monitor for an option trader, especially in volatile markets, since the value of some option strategies can be particularly sensitive to changes in volatility. The value of an option straddle, for example, is extremely dependent on changes to volatility.
Theta
Theta,[4] , measures the sensitivity of the value of the derivative to the passage of time (see Option time value): the "time decay."
The mathematical result of the formula for theta (see below) is expressed in value per year. By convention, it is usual to divide the result by the number of days in a year, to arrive at the amount of money per share of the underlying that the option loses in one day. Theta is almost always negative for long calls and puts and positive for short (or written) calls and puts. An exception is a deep in-the-money European put. The total theta for a portfolio of options can be determined by summing the thetas for each individual position.
The value of an option can be analysed into two parts: the intrinsic value and the time value. The intrinsic value is the amount of money you would gain if you exercised the option immediately, so a call with strike $50 on a stock with price $60 would have intrinsic value of $10, whereas the corresponding put would have zero intrinsic value. The time value is the value of having the option of waiting longer before deciding to exercise. Even a deeply out of the money put will be worth something, as there is some chance the stock price will fall below the strike before the expiry date. However, as time approaches maturity, there is less chance of this happening, so the time value of an option is decreasing with time. Thus if you are long an option you are short theta: your portfolio will lose value with the passage of time (all other factors held constant).
Rho
Rho,[4] , measures sensitivity to the interest rate: it is the derivative of the option value with respect to the risk free interest rate (for the relevant outstanding term).
Except under extreme circumstances, the value of an option is less sensitive to changes in the risk free interest rate than to changes in other parameters. For this reason, rho is the least used of the first-order Greeks.
Rho is typically expressed as the amount of money, per share of the underlying, that the value of the option will gain or lose as the risk free interest rate rises or falls by 1.0% per annum (100 basis points).
Lambda
Lambda, , omega, , or elasticity[4] is the percentage change in option value per percentage change in the underlying price, a measure of leverage, sometimes called gearing.
Second-order Greeks
<Gamma>...</Gamma>
Gamma
Gamma,[4] , measures the rate of change in the delta with respect to changes in the underlying price. Gamma is the second derivative of the value function with respect to the underlying price. All long options have positive gamma and all short options have negative gamma. Gamma is greatest approximately at-the-money (ATM) and diminishes the further out you go either in-the-money (ITM) or out-of-the-money (OTM). Gamma is important because it corrects for the convexity of value.
When a trader seeks to establish an effective delta-hedge for a portfolio, the trader may also seek to neutralize the portfolio's gamma, as this will ensure that the hedge will be effective over a wider range of underlying price movements. However, in neutralizing the gamma of a portfolio, alpha (the return in excess of the risk-free rate) is reduced.
Vanna
Vanna,[4] also referred to as DvegaDspot and DdeltaDvol, [8] is a second order derivative of the option value, once to the underlying spot price and once to volatility. It is mathematically equivalent to DdeltaDvol, the sensitivity of the option delta with respect to change in volatility; or alternatively, the partial of vega with respect to the underlying instrument's price. Vanna can be a useful sensitivity to monitor when maintaining a delta- or vega-hedged portfolio as vanna will help the trader to anticipate changes to the effectiveness of a delta-hedge as volatility changes or the effectiveness of a vega-hedge against change in the underlying spot price.
Vomma
Vomma, Volga, Vega Convexity,[9] Vega gamma or dTau/dVol measures second order sensitivity to volatility. Vomma is the second derivative of the option value with respect to the volatility, or, stated another way, vomma measures the rate of change to vega as volatility changes. With positive vomma, a position will become long vega as implied volatility increases and short vega as it decreases, which can be scalped in a way analogous to long gamma. And an initially vega-neutral, long-vomma position can be constructed from ratios of options at different strikes. Vomma is positive for options away from the money, and initially increases with distance from the money (but drops off as vega drops off). (Specifically, vomma is positive where the usual d1 and d2 terms are of the same sign, which is true when d2 < 0 or d1 > 0.)
Charm
Charm[4] or delta decay, measures the instantaneous rate of change of delta over the passage of time. Charm has also been called DdeltaDtime.[8] Charm can be an important Greek to measure/monitor when delta-hedging a position over a weekend. Charm is a second-order derivative of the option value, once to price and once to the passage of time. It is also then the derivative of theta with respect to the underlying's price.
The mathematical result of the formula for charm (see below) is expressed in delta/year. It is often useful to divide this by the number of days per year to arrive at the delta decay per day. This use is fairly accurate when the number of days remaining until option expiration is large. When an option nears expiration, charm itself may change quickly, rendering full day estimates of delta decay inaccurate.
Veta
Veta, or DvegaDtime,[9] measures the rate of change in the vega with respect to the passage of time. Veta is the second derivative of the value function; once to volatility and once to time.
It is common practice to divide the mathematical result of veta by 100 times the number of days per year to reduce the value to the percentage change in vega per one day.
Vera
Vera (sometimes Rhova) measures the rate of change in rho with respect to volatility. Vera is the second derivative of the value function; once to volatility and once to interest rate. Vera can be used to assess the impact of volatility change on rho-hedging.
Third-order Greeks
Color
Color,[note 2] gamma decay or DgammaDtime[8] measures the rate of change of gamma over the passage of time. Color is a third-order derivative of the option value, twice to underlying asset price and once to time. Color can be an important sensitivity to monitor when maintaining a gamma-hedged portfolio as it can help the trader to anticipate the effectiveness of the hedge as time passes.
The mathematical result of the formula for color (see below) is expressed in gamma/year. It is often useful to divide this by the number of days per year to arrive at the change in gamma per day. This use is fairly accurate when the number of days remaining until option expiration is large. When an option nears expiration, color itself may change quickly, rendering full day estimates of gamma change inaccurate.
Speed
Speed[4] measures the rate of change in Gamma with respect to changes in the underlying price. This is also sometimes referred to as the gamma of the gamma[2]Primarily based on the most recent URA personal property value index (PPPI) flash estimates, we know that the PPPI, which represents the overall real property price development, has dipped in 2013Q4. That is the first dip the market has seen within the final 2 years.
To give you some perspective, the entire number of personal properties in Singapore (together with govt condominiums) is 297,689 in 2013Q3. Primarily based on the projection that there will be 19,302 units accomplished in 2014, the rise in residential models works out to be more than 6%. With a lot New Ec Launch Singapore provide, buyers might be spoilt for alternative and this in flip will lead to their reluctance to pay a premium for potential models. The complete textual content of the Copyright Act (Cap sixty three) and different statutes regarding IPR might be found on the Singapore Statutes Online Website online The Group's income jumped forty.1 p.c to $324.5 million from $231.6 million in FY 2013, lifted by increased development income and sales of growth properties in Singapore and China. Actual Estate Shopping for
One factor we've on this nation is a big group of "economists," and "market analysts." What's interesting about this group of real property market-watchers is that there are two very other ways wherein they predict Boomers will affect housing markets over the subsequent decade. Let's check out those two opposites and see how every can change the best way real property investors strategy their markets. The good news is that actual property buyers are prepared for either state of affairs, and there's profit in being ready. I'm excited and searching ahead to the alternatives both or each of these conditions will supply; thank you Boomers! Mapletree to further broaden past Asia Why fortune will favour the brave in Asia's closing real property frontier
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First, there are typically extra rental transactions than gross sales transactions, to permit AV to be decided for each property primarily based on comparable properties. Second, movements in sale costs are more unstable than leases. Hence, utilizing rental transactions to derive the AV helps to maintain property tax more steady for property homeowners. If you're buying or trying to lease a property. It's tiring to call up individual property agent, organize appointments, coordinate timing and to go for particular person property viewing. What most individuals do is to have a property agent representing them who will arrange and coordinate the viewings for all the properties out there based mostly on your necessities & most well-liked timing. Rent Property District 12 Rent Property District thirteen
The Annual Worth of a property is mostly derived based mostly on the estimated annual hire that it may well fetch if it have been rented out. In determining the Annual Worth of a property, IRAS will think about the leases of similar properties within the vicinity, dimension and condition of the property, and different relevant components. The Annual Worth of a property is determined in the identical method regardless of whether the property is let-out, proprietor-occupied or vacant. The Annual Worth of land is determined at 5% of the market price of the land. When a constructing is demolished, the Annual Worth of the land is assessed by this method. Property Tax on Residential Properties Buyer Stamp Responsibility on Buy of Properties – Business and residential properties Rent House District 01
Within the event the Bank's valuation is decrease than the acquisition price, the purchaser has to pay the distinction between the purchase value and the Bank's valuation utilizing money. As such, the money required up-front might be increased so it's at all times essential to know the valuation of the property before making any offer. Appoint Lawyer The Bank will prepare for a proper valuation of the property by way of physical inspection The completion statement will present you the balance of the acquisition price that you must pay after deducting any deposit, pro-rated property tax and utility costs, upkeep prices, and different relevant expenses in addition to any fees payable to the agent and the lawyer. Stamp Responsibility Primarily based on the Purchase Price or Market Value, whichever is larger or DgammaDspot.[8] Speed is the third derivative of the value function with respect to the underlying spot price. Speed can be important to monitor when delta-hedging or gamma-hedging a portfolio.
Ultima
Ultima[4] measures the sensitivity of the option vomma with respect to change in volatility. Ultima has also been referred to as DvommaDvol.[4] Ultima is a third-order derivative of the option value to volatility.
Zomma
Zomma[4] measures the rate of change of gamma with respect to changes in volatility. Zomma has also been referred to as DgammaDvol.[8] Zomma is the third derivative of the option value, twice to underlying asset price and once to volatility. Zomma can be a useful sensitivity to monitor when maintaining a gamma-hedged portfolio as zomma will help the trader to anticipate changes to the effectiveness of the hedge as volatility changes.
Greeks for multi-asset options
If the value of a derivative is dependent on two or more underlyings, its Greeks are extended to include the cross-effects between the underlyings.
Correlation delta measures the sensitivity of the derivative's value to a change in the correlation between the underlyings.Potter or Ceramic Artist Truman Bedell from Rexton, has interests which include ceramics, best property developers in singapore developers in singapore and scrabble. Was especially enthused after visiting Alejandro de Humboldt National Park.
Cross gamma measures the rate of change of delta in one underlying to a change in the level of another underlying. [10]
Cross vanna measures the rate of change of vega in one underlying due to a change in the level of another underlying. Equivalently, it measures the rate of change of delta in the second underlying due to a change in the volatility of the first underlying.Potter or Ceramic Artist Truman Bedell from Rexton, has interests which include ceramics, best property developers in singapore developers in singapore and scrabble. Was especially enthused after visiting Alejandro de Humboldt National Park.
Cross volga measures the rate of change of vega in one underlying to a change in the volatility of another underlying.[10]
Formulas for European option Greeks
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In 12 months 2013, c ommercial retails, shoebox residences and mass market properties continued to be the celebrities of the property market. Models are snapped up in report time and at document breaking prices. Builders are having fun with overwhelming demand and patrons need more. We feel that these segments of the property market are booming is a repercussion of the property cooling measures no.6 and no. 7. With additional buyer's stamp responsibility imposed on residential properties, buyers change their focus to commercial and industrial properties. I imagine every property purchasers need their property funding to understand in value.
The Greeks of European options (calls and puts) under the Black–Scholes model are calculated as follows, where (phi) is the standard normal probability density function and is the standard normal cumulative distribution function. Note that the gamma and vega formulas are the same for calls and puts.
For a given: Stock Price , Strike Price , Risk-Free Rate , Annual Dividend Yield , Time to Maturity , and Volatility ...
Calls | Puts | |
---|---|---|
value | ||
delta | ||
vega | ||
theta | ||
rho | ||
gamma | ||
vanna | ||
charm | ||
speed | ||
zomma | ||
color | ||
veta | ||
vomma | ||
Ultima | ||
dual delta | ||
dual gamma |
where
Related measures
Some related risk measures of financial derivatives are listed below.
Bond duration and convexity
Mining Engineer (Excluding Oil ) Truman from Alma, loves to spend time knotting, largest property developers in singapore developers in singapore and stamp collecting. Recently had a family visit to Urnes Stave Church. In trading of fixed income securities (bonds), various measures of bond duration are used analogously to the delta of an option. The closest analogue to the delta is DV01, which is the reduction in price (in currency units) for an increase of one basis point (i.e. 0.01% per annum) in the yield (the yield is the underlying variable).
Analogous to the lambda is the modified duration, which is the percentage change in the market price of the bond(s) for a unit change in the yield (i.e. it is equivalent to DV01 divided by the market price). Unlike the lambda, which is an elasticity (a percentage change in output for a percentage change in input), the modified duration is instead a semi-elasticity—a percentage change in output for a unit change in input.
Bond convexity is a measure of the sensitivity of the duration to changes in interest rates, the second derivative of the price of the bond with respect to interest rates (duration is the first derivative). In general, the higher the convexity, the more sensitive the bond price is to the change in interest rates. Bond convexity is one of the most basic and widely used forms of convexity in finance.
Beta
Mining Engineer (Excluding Oil ) Truman from Alma, loves to spend time knotting, largest property developers in singapore developers in singapore and stamp collecting. Recently had a family visit to Urnes Stave Church. The Beta (β) of a stock or portfolio is a number describing the volatility of an asset in relation to the volatility of the benchmark that said asset is being compared to. This benchmark is generally the overall financial market and is often estimated via the use of representative indices, such as the S&P 500.
An asset has a Beta of zero if its returns change independently of changes in the market's returns. A positive beta means that the asset's returns generally follow the market's returns, in the sense that they both tend to be above their respective averages together, or both tend to be below their respective averages together. A negative beta means that the asset's returns generally move opposite the market's returns: one will tend to be above its average when the other is below its average.
Fugit
Mining Engineer (Excluding Oil ) Truman from Alma, loves to spend time knotting, largest property developers in singapore developers in singapore and stamp collecting. Recently had a family visit to Urnes Stave Church. The fugit is the expected time to exercise an American or Bermudan option. It is useful to compute it for hedging purposes—for example, one can represent flows of an American swaption like the flows of a swap starting at the fugit multiplied by delta, then use these to compute sensitivities.
See also
Notes
43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.
References
43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.
External links
Discussion
- Why We Have Never Used the Black-Scholes-Merton Option Pricing Formula, Nassim Taleb and Espen Gaarder Haug
Theory
- Delta, Gamma, GammaP, Gamma symmetry, Vanna, Speed, Charm, Saddle Gamma: Vanilla Options - Espen Haug,
- Volga, Vanna, Speed, Charm, Color: Vanilla Options - Uwe Wystup, Vanilla Options - Uwe Wystup
Online tools
- Surface Plots of Black-Scholes Greeks, Chris Murray
- Online real-time option prices and Greeks calculator when the underlying is normally distributed, Razvan Pascalau, Univ. of Alabama
- Excel-based tool to calculate the Greeks - A free excel sheet provided by Pristine
- ↑ 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 - ↑ 2.0 2.1 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 - ↑ 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 - ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 4.11 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 - ↑ Template:Cite web
- ↑ Template:Cite web
- ↑ 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 - ↑ 8.0 8.1 8.2 8.3 8.4
Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010 - ↑ 9.0 9.1
Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010 - ↑ 10.0 10.1 Template:Cite web
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