Stieltjes constants: Difference between revisions

From formulasearchengine
Jump to navigation Jump to search
en>ChrisGualtieri
m →‎References: Remove stub template(s). Page is start class or higher. Also check for and do General Fixes + Checkwiki fixes using AWB
en>Gilliam
m Reverted edits by 88.113.147.227 (talk) to last version by ChrisGualtieri
Line 1: Line 1:
{{Refimprove|date=October 2008}}
New Rental Launches , as soon as we're appointed by the developer. We'll receive the first-hand information about the challenge in comparison with an non-appointed agent. Depending on the timeline given, the launch date could be just over in per week or greater than a month. We will upload the primary-hand data out there at your fingertips anytime anywhere !<br><br>The island nation Singapore has a number of locations of interest which are value a go to. The main island is adorned with islets that encircle the island. In total, there are 60 islets. Every of those islets is exclusive in its personal manner and has so much to offer to its guests. Singapore is an intoxicating mix of the outdated and the new predominated by the Asian tradition. Whereas each nook and corner of this sma read more StarLight Suite is a exclusive 105-models River Valley condo residence. At 35-Storeys excessive, Starlight Suites shall be one of the crucial iconic property in Read Extra The Rise @ Oxley Residences is a singular freehold combined growth situated at 71 Oxley Rise Singapore prime district 9 featuring both residential and  Learn Extra Duo Residences @ Bugis<br><br>Property administration services are becoming more and more in style across the globe, and maybe no more so than within the condominium spectrum. Condo association management companies can play a huge function in helping a neighborhood perform well regarding relationships, rules, and laws. They act to stop issues from arising as well as work towards solutions  [http://ece.modares.ac.ir/mnl/?q=node/1130162 http://ece.modares.ac.ir/] if and when they do. There are various levels of professionalism within these providers, in fact, as with every other business. learn extra<br><br>Singapore first retirement condominium ny World Class Development (North) Pte Ltd. With Shopping, dining and entertainment services out there at the nearby Bukit Timah Purchasing Centre, Magnificence World Centre / Plaza, Rail Mall and plenty of consuming retailers along Jalan Jurong Kechil, Before you make the trip to that swanky new launch condominium showflat, it's useful to first decide your financial strength. Your buying power is not only limited by your income, but additionally by the number of current properties underneath your identify. Moreover, the maximum amount of cash you'll be able to mortgage from the financial institution is also restricted by the mixed sum of your monthly financial commitments. Lake Vista Yuan Ching Highway (DBSS) Lake Vista - New Launch DBSS at Yuan Ching Road<br><br>There are 2 methods to analyzing this information. The conservative may take into consideration this period an inaccurate time to make investments because the value is rising. They'd consider waiting for a time when costs begin to fall. However, when that may happen, may very well be the big question! It is naïve to imagine that prices can rise indefinitely. The market by no means goes up or down ceaselessly. It's destined to vary course at a certain point of time. When the market is scorching, there isn't a should be too excited. Likewise, when the market is gloomy, it's not necessary to be too pessimistic. While more persons are traveling to Asia for pleasure and business needs, Asiana Airlines is turning into well known as a prime rated airline to get people there. learn extra Corals @ Keppel Bay<br><br>Subsequently, with all that mentioned, the place else can you find riverfront residing like this? You will be assured a stupendous view that others can only be envious of, you can be conveniently positioned near public transport and expressways, you will be spoilt for choice when it comes to eating, shopping and entertainment choices and lastly, you'll be rest assured that there are plenty of good colleges for your youngsters. Rivertrees Residences is indeed an upcoming new launch condominium that many ought to take into account to dwell in.<br><br>Our lodge, the Valley Wing of Shangri-La Singapore was simply off of Orchard Highway, a five-minute walk from the motion. The most luxurious of the three wings at Shangri-La Singapore, the foyer of the Valley Wing is covered in white orchids and hung with silk murals and crystal chandeliers. The service is impeccable and company are handled to complimentary champagne and excessive tea. We sat and loved Moët and finger sandwiches one afternoon while it poured outside - our teatime coincided completely with a 3 'clock thunderstorm. Champagne Bar within the Valley Wing Lobby<br><br>What if you went to Singapore and by accident let it slip that you thought human rights had been a good suggestion? It is so clean and good there, it is simple to not notice that Singapore's government is (I've simply observed) grouped with comparable Liberia, Palestine, Georgia, and Haiti by The Economist's " Democracy Index" The reports read that destressed property investors flipped near a hundred,000 homes within the first half of 2012, and made a mean of $30,000 per home. The figures are certainly, luring! This article gives a whole view to it's readers about the preferred exit technique in the San Antonio real estate investment market. And likewise offers a whole guideline on property administration. All abroad properties promise handsome revenue? Riverbank @ Fernvale
'''Cournot competition''' is an [[economic]] model used to describe an industry structure in which companies compete on the amount of output they will produce, which they decide on independently of each other and at the same time. It is named after [[Antoine Augustin Cournot]]<ref name="varian">{{citation | last=Varian | first=Hal R. | authorlink=Hal Varian | year=2006 | title=Intermediate microeconomics: a modern approach | edition=7 | publisher=[[W. W. Norton & Company]] | isbn=0-393-92702-4 | page=490 }}</ref> (1801–1877) who was inspired by observing competition in a spring water [[duopoly]]. It has the following features:
* There is more than one firm and all firms produce a [[wiktionary:Homogeneous|homogeneous]] [[Product (business)|product]], i.e. there is no [[product differentiation]];
* Firms do not cooperate, i.e. there is no [[collusion]];
* Firms have [[market power]], i.e. each firm's output decision affects the good's price;
* The number of firms is fixed;
* Firms compete in quantities, and choose quantities simultaneously;
* The firms are economically rational and [[game theory|act strategically]], usually seeking to maximize profit given their competitors' decisions.
 
An essential assumption of this model is the "not conjecture" that each firm aims to maximize profits, based on the expectation that its own output decision will not have an effect on the decisions of its rivals.
Price is a commonly known decreasing function of total output. All firms know <math>N</math>, the total number of firms in the market, and take the output of the others as given. Each firm has a [[Cost curve|cost function]] <math>c_i(q_i)</math>. Normally the cost functions are treated as common knowledge. The cost functions may be the same or different among firms. The market price is set at a level such that [[Supply and demand|demand]] equals the total quantity produced by all firms.
Each firm takes the quantity set by its competitors as a given, evaluates its residual demand, and then behaves as a [[monopoly]].
 
== History ==
{{Rquote|right|The state of equilibrium... is therefore ''stable''; i.e. if either of the producers, misled as to his true interest, leaves it temporarily, he will be brought back to it.|Antoine Augustin Cournot|''Recherches sur les Principes Mathematiques de la Theorie des Richesses'' (1838), translated by Bacon (1897).}}
 
[[Antoine Augustin Cournot]] (1801-1877) first outlined his theory of competition in his 1838 volume ''Recherches sur les Principes Mathematiques de la Theorie des Richesses'' as a way of describing the competition with a market for spring water dominated by two suppliers (a [[duopoly]]).<ref name="berg">{{harvnb|Van den Berg|Bos|Herings|Peters|2011|p=1}}</ref> The model was one of a number that Cournot set out "explicitly and with mathematical precision" in the volume.<ref name="morrison">{{harvnb|Morrison|1998}}</ref> Specifically, Cournot constructed profit functions for each firm, and then used [[partial differentiation]] to construct a function representing a firm's [[best response]] for given (exogenous) output levels of the other firm(s) in the market.<ref name="morrison"/> He then showed that a stable equilibrium occurs where these functions intersect (i.e. the simultaneous solution of the best response functions of each firm).<ref name="morrison"/>
 
The consequence of this is that in equilibrium, each firm's expectations of how other firms will act are shown to be correct; when all is revealed, no firm wants to change its output decision.<ref name="varian"/> This idea of stability was later taken up and built upon as a description of [[Nash equilibria]], of which Cournot equilibria are a subset.<ref name="morrison"/>
 
==Graphically finding the Cournot duopoly equilibrium==
This section presents an analysis of the model with 2 firms and constant [[marginal cost]].
 
:<math>p_1</math> = firm 1 price, <math>p_2</math> = firm 2 price
 
:<math>q_1</math> = firm 1 quantity, <math>q_2</math> = firm 2 quantity
 
:<math>c</math> = [[marginal cost]], identical for both firms
 
[[Economic equilibrium|Equilibrium]] prices will be:
:<math>p_1 = p_2 = P(q_1+q_2)</math>
 
This implies that firm 1’s profit is given by <math>\Pi_1 = q_1(P(q_1+q_2)-c)</math>
* Calculate firm 1’s residual demand: Suppose firm 1 believes firm 2 is producing quantity <math>q_2</math>. What is firm 1's optimal quantity? Consider the diagram 1. If firm 1 decides not to produce anything, then price is given by <math>P(0+q_2)=P(q_2)</math>. If firm 1 produces <math>q_1'</math> then price is given by <math>P(q_1'+q_2)</math>. More generally, for each quantity that firm 1 might decide to set, price is given by the curve <math>d_1(q_2)</math>. The curve <math>d_1(q_2)</math> is called firm 1’s residual demand; it gives all possible combinations of firm 1’s quantity and price for a given value of <math>q_2</math>.
 
[[File:economics cournot diag1 svg.svg]]
* Determine firm 1’s optimum output: To do this we must find where marginal revenue equals marginal cost. Marginal cost (c) is assumed to be constant. Marginal revenue is a curve - <math>r_1(q_2)</math> - with twice the slope of <math>d_1(q_2)</math> and with the same vertical intercept. The point at which the two curves (<math>c</math> and <math>r_1(q_2)</math>) intersect corresponds to quantity <math>q_1''(q_2)</math>. Firm 1’s optimum <math>q_1''(q_2)</math>, depends on what it believes firm 2 is doing. To find an equilibrium, we derive firm 1’s optimum for other possible values of <math>q_2</math>. Diagram 2 considers two possible values of <math>q_2</math>. If <math>q_2=0</math>, then the first firm's residual demand is effectively the market demand, <math>d_1(0)=D</math>. The optimal solution is for firm 1 to choose the [[monopoly]] quantity; <math>q_1''(0)=q^m</math> (<math>q^m</math> is monopoly quantity). If firm 2 were to choose the quantity corresponding to [[perfect competition]], <math>q_2=q^c</math> such that <math>P(q^c)=c</math>, then firm 1’s optimum would be to produce nil: <math>q_1''(q^c)=0</math>. This is the point at which marginal cost intercepts the marginal revenue corresponding to <math>d_1(q^c)</math>.
 
[[File:economics cournot diag2 svg.svg]]
* It can be shown that, given the linear demand and constant marginal cost, the function <math>q_1''(q_2)</math> is also linear. Because we have two points, we can draw the entire function <math>q_1''(q_2)</math>, see diagram 3. Note the axis of the graphs has changed, The function <math>q_1''(q_2)</math> is firm 1’s reaction function, it gives firm 1’s optimal choice for each possible choice by firm 2. In other words, it gives firm 1’s choice given what it believes firm 2 is doing.
 
[[File:economics cournot diag3 svg.svg]]
* The last stage in finding the Cournot equilibrium is to find firm 2’s reaction function. In this case it is symmetrical to firm 1’s as they have the same cost function. The equilibrium is the intersection point of the reaction curves. See diagram 4.
 
[[File:economics cournot diag4 svg.svg|375 px|]]
* The prediction of the model is that the firms will choose [[Nash equilibrium]] output levels.
 
==Calculating the equilibrium==
In very general terms, let the price function for the (duopoly) industry be <math>P(q_1+q_2)</math> and firm i have the cost structure <math>C_i(q_i)</math>. To calculate the Nash equilibrium, the [[best response|best response functions]] of the firms must first be calculated.
 
The profit of firm i is revenue minus cost. Revenue is the product of price and quantity and cost is given by the firm's cost function, so profit is (as described above):
<math>\Pi_i = P(q_1+q_2) \cdot q_i - C_i(q_i)</math>. The best response is to find the value of <math>q_i</math> that maximises <math>\Pi_i</math> given <math>q_j</math>, with <math>i \ne j</math>, i.e. given some output of the opponent firm, the output that maximises profit is found. Hence, the maximum of <math>\Pi_i</math> with respect to <math>q_i</math> is to be found. First take the derivative of <math>\Pi_i</math> with respect to <math>q_i</math>:
 
:<math>\frac{\partial \Pi_i }{\partial q_i} = \frac{\partial P(q_1+q_2) }{\partial q_i} \cdot q_i + P(q_1+q_2) - \frac{\partial C_i (q_i)}{\partial q_i}</math>
 
Setting this to zero for maximization:
 
:<math>\frac{\partial \Pi_i }{\partial q_i} = \frac{\partial P(q_1+q_2) }{\partial q_i} \cdot q_i + P(q_1+q_2) - \frac{\partial C_i (q_i)}{\partial q_i}=0</math>
 
The values of <math>q_i</math> that satisfy this equation are the best responses. The Nash equilibria are where both <math>q_1</math> and <math>q_2</math> are best responses given those values of <math>q_1</math> and <math>q_2</math>.
 
===An example===
Suppose the industry has the following price structure: <math>P(q_1+q_2)= a - (q_1+q_2)</math> The profit of firm i (with cost structure <math>C_i(q_i)</math> such that <math>\frac{\partial ^2C_i (q_i)}{\partial q_i^2}=0</math> and <math>\frac{\partial C_i (q_i)}{\partial q_j}=0, j \ne i</math> for ease of computation) is:
 
:<math>\Pi_i = \bigg(a - (q_1+q_2)\bigg) \cdot q_i - C_i(q_i)</math>
 
The maximization problem resolves to (from the general case):
 
:<math>\frac{\partial \bigg(a - (q_1+q_2)\bigg) }{\partial q_i} \cdot q_i + a - (q_1+q_2) - \frac{\partial C_i (q_i)}{\partial q_i}=0</math>
 
Without loss of generality, consider firm 1's problem:
 
:<math>\frac{\partial \bigg(a - (q_1+q_2)\bigg) }{\partial q_1} \cdot q_1 + a - (q_1+q_2) - \frac{\partial C_1 (q_1)}{\partial q_1}=0</math>
 
:<math>\Rightarrow \ - q_1 + a - (q_1+q_2) - \frac{\partial C_1 (q_1)}{\partial q_1}=0</math>
 
:<math>\Rightarrow \ q_1 = \frac{a - q_2 - \frac{\partial C_1 (q_1)}{\partial q_1}}{2}</math>
 
By symmetry:
 
:<math>\Rightarrow \ q_2 = \frac{a - q_1 - \frac{\partial C_2 (q_2)}{\partial q_2}}{2}</math>
 
These are the firms' best response functions. For any value of <math>q_2</math>, firm 1 responds best with any value of <math>q_1</math> that satisfies the above. In Nash equilibria, both firms will be playing best responses so solving the above equations [[simultaneous equation|simultaneously]]. Substituting for <math>q_2</math> in firm 1's best response:
 
:<math>\ q_1 = \frac{a - \left(\frac{a - q_1 - \frac{\partial C_2 (q_2)}{\partial q_2}}{2}\right) - \frac{\partial C_1 (q_1)}{\partial q_1}}{2}</math>
 
:<math>\Rightarrow \ q_1^* = \frac{a + \frac{\partial C_2 (q_2)}{\partial q_2} - 2*\frac{\partial C_1 (q_1)}{\partial q_1}}{3}</math>
 
:<math>\Rightarrow \ q_2^* = \frac{a + \frac{\partial C_1 (q_1)}{\partial q_1} - 2^*\frac{\partial C_2 (q_2)}{\partial q_2}}{3}</math>
 
The symmetric Nash equilibrium is at <math>(q_1^*,q_2^*)</math>. (See Holt (2005, Chapter 13) for asymmetric examples.)  Making suitable assumptions for the partial derivatives (for example, assuming each firm's cost is a linear function of quantity and thus using the slope of that function in the calculation), the equilibrium quantities can be substituted in the assumed industry price structure <math>P(q_1+q_2)= a - (q_1+q_2)</math> to obtain the equilibrium market price.
 
==Cournot competition with many firms and the Cournot theorem==
For an arbitrary number of firms, ''N''&nbsp;>&nbsp;1, the quantities and price can be derived in a manner analogous to that given above. With linear demand and identical, constant marginal cost the equilibrium values are as follows:
 
edit; we should specify the constants. Given the following results are these;
 
Market demand; <math>\ p(q)=a-bq=a-bQ=p(Q) </math>
 
Cost function; <math>\ c_i(q_i)=cq_i </math>, for all i
 
:<math>\ q_i = Q/N = \frac{a-c} {b(N+1)},</math>
 
which is each individual firm's output
 
:<math>\sum q_i = Nq = \frac{N(a-c)} {b(N+1)},</math>
 
which is total industry output
 
:<math>\ p =a-b(Nq)= \frac{a + Nc} {N+1},</math>
 
which is the market clearing price, and
 
:<math>\Pi_i = \left(\frac{a - c} {N+1}\right)^2 \left(\frac{1}{b}\right)</math> ,  which is each individual firm's profit.
 
The Cournot Theorem then states that, in absence of fixed costs of production, as the number of firms in the market, ''N'', goes to infinity, market output, ''Nq'', goes to the competitive level and the price converges to marginal cost.
 
:<math>\lim_{N\rightarrow \infty} p = c</math>
 
Hence with many firms a Cournot market approximates a perfectly competitive market. This result can be generalized to the case of firms with different cost structures (under appropriate restrictions) and non-linear demand.
 
When the market is characterized by fixed costs of production, however, we can endogenize the number of competitors imagining that firms enter in the market until their profits are zero. In our linear example with <math>N</math> firms, when fixed costs for each firm are <math>F</math>, we have the endogenous number of firms:
 
:<math>N=\frac{a-c}{\sqrt{Fb}}-1</math>
 
and a production for each firm equal to:
 
:<math>q=\frac{\sqrt{Fb}}{b}</math>
 
This equilibrium is usually known as Cournot equilibrium with endogenous entry, or Marshall equilibrium.<ref name=Etro_6>Etro, Federico. ''[http://dipeco.economia.unimib.it/persone/etro/economia_e_politica_della_concorrenza/notes.pdf Simple models of competition]'', page 6, Dept. Political Economics -- Università di Milano-Bicocca, November 2006</ref>
 
==Implications==
* Output is greater with Cournot duopoly than monopoly, but lower than perfect competition.
* Price is lower with Cournot duopoly than monopoly, but not as low as with perfect competition.
* According to this model the firms have an incentive to form a cartel, effectively turning the Cournot model into a Monopoly. Cartels are usually illegal, so firms might instead tacitly collude using self-imposing strategies to reduce output which, ''[[ceteris paribus]]'' will raise the price and thus increase profits for all firms involved.
 
==Bertrand versus Cournot==
Although both models have similar assumptions, they have very different implications:
* Since the [[Bertrand game|Bertrand model]] assumes that firms compete on price and not output quantity, it predicts that a [[duopoly]] is enough to push prices down to marginal cost level, meaning that a duopoly will result in [[perfect competition]].
* Neither model is necessarily "better." The accuracy of the predictions of each model will vary from industry to industry, depending on the closeness of each model to the industry situation.
* If capacity and output can be easily changed, [[Bertrand competition|Bertrand]] is a better model of duopoly competition. If output and capacity are difficult to adjust, then  Cournot is generally a better model.
* Under some conditions the Cournot model can be recast as a two stage model, where in the first stage firms choose capacities, and in the second they compete in Bertrand fashion.
However, as the number of firms increases towards infinity, the Cournot model gives the same result as in Bertrand model: The market price is pushed to marginal cost level.
 
==See also==
* [[Aggregative game]]
* [[Bertrand competition]]
* [[Bertrand–Edgeworth model]]
* [[Conjectural variation]]
* [[Game theory]]
* [[Nash equilibrium]]
* [[Stackelberg competition]]
* [[Tacit collusion]]
 
==References==
{{reflist}}
*[[Charles A. Holt|Holt, Charles]]. ''Games and Strategic Behavior (PDF version)'', [http://harbaugh.uoregon.edu/Readings/expbooknsf.pdf PDF]
*[[Tirole, Jean]]. ''The Theory of Industrial Organization'', MIT Press, 1988.
*[http://huwdixon.org/SurfingEconomics/chapter6.pdf Oligoply Theory made Simple], Chapter 6 of [http://huwdixon.org/SurfingEconomics/index.html Surfing Economics] by [[Huw Dixon]].
 
{{game theory}}
 
[[Category:Economics models]]
[[Category:Game theory]]
[[Category:Competition (economics)]]
[[Category:Oligopoly]]

Revision as of 07:22, 16 February 2014

New Rental Launches , as soon as we're appointed by the developer. We'll receive the first-hand information about the challenge in comparison with an non-appointed agent. Depending on the timeline given, the launch date could be just over in per week or greater than a month. We will upload the primary-hand data out there at your fingertips anytime anywhere !

The island nation Singapore has a number of locations of interest which are value a go to. The main island is adorned with islets that encircle the island. In total, there are 60 islets. Every of those islets is exclusive in its personal manner and has so much to offer to its guests. Singapore is an intoxicating mix of the outdated and the new predominated by the Asian tradition. Whereas each nook and corner of this sma read more StarLight Suite is a exclusive 105-models River Valley condo residence. At 35-Storeys excessive, Starlight Suites shall be one of the crucial iconic property in Read Extra The Rise @ Oxley Residences is a singular freehold combined growth situated at 71 Oxley Rise Singapore prime district 9 featuring both residential and Learn Extra Duo Residences @ Bugis

Property administration services are becoming more and more in style across the globe, and maybe no more so than within the condominium spectrum. Condo association management companies can play a huge function in helping a neighborhood perform well regarding relationships, rules, and laws. They act to stop issues from arising as well as work towards solutions http://ece.modares.ac.ir/ if and when they do. There are various levels of professionalism within these providers, in fact, as with every other business. learn extra

Singapore first retirement condominium ny World Class Development (North) Pte Ltd. With Shopping, dining and entertainment services out there at the nearby Bukit Timah Purchasing Centre, Magnificence World Centre / Plaza, Rail Mall and plenty of consuming retailers along Jalan Jurong Kechil, Before you make the trip to that swanky new launch condominium showflat, it's useful to first decide your financial strength. Your buying power is not only limited by your income, but additionally by the number of current properties underneath your identify. Moreover, the maximum amount of cash you'll be able to mortgage from the financial institution is also restricted by the mixed sum of your monthly financial commitments. Lake Vista Yuan Ching Highway (DBSS) Lake Vista - New Launch DBSS at Yuan Ching Road

There are 2 methods to analyzing this information. The conservative may take into consideration this period an inaccurate time to make investments because the value is rising. They'd consider waiting for a time when costs begin to fall. However, when that may happen, may very well be the big question! It is naïve to imagine that prices can rise indefinitely. The market by no means goes up or down ceaselessly. It's destined to vary course at a certain point of time. When the market is scorching, there isn't a should be too excited. Likewise, when the market is gloomy, it's not necessary to be too pessimistic. While more persons are traveling to Asia for pleasure and business needs, Asiana Airlines is turning into well known as a prime rated airline to get people there. learn extra Corals @ Keppel Bay

Subsequently, with all that mentioned, the place else can you find riverfront residing like this? You will be assured a stupendous view that others can only be envious of, you can be conveniently positioned near public transport and expressways, you will be spoilt for choice when it comes to eating, shopping and entertainment choices and lastly, you'll be rest assured that there are plenty of good colleges for your youngsters. Rivertrees Residences is indeed an upcoming new launch condominium that many ought to take into account to dwell in.

Our lodge, the Valley Wing of Shangri-La Singapore was simply off of Orchard Highway, a five-minute walk from the motion. The most luxurious of the three wings at Shangri-La Singapore, the foyer of the Valley Wing is covered in white orchids and hung with silk murals and crystal chandeliers. The service is impeccable and company are handled to complimentary champagne and excessive tea. We sat and loved Moët and finger sandwiches one afternoon while it poured outside - our teatime coincided completely with a 3 'clock thunderstorm. Champagne Bar within the Valley Wing Lobby

What if you went to Singapore and by accident let it slip that you thought human rights had been a good suggestion? It is so clean and good there, it is simple to not notice that Singapore's government is (I've simply observed) grouped with comparable Liberia, Palestine, Georgia, and Haiti by The Economist's " Democracy Index" The reports read that destressed property investors flipped near a hundred,000 homes within the first half of 2012, and made a mean of $30,000 per home. The figures are certainly, luring! This article gives a whole view to it's readers about the preferred exit technique in the San Antonio real estate investment market. And likewise offers a whole guideline on property administration. All abroad properties promise handsome revenue? Riverbank @ Fernvale