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In economics, '''Epstein–Zin preferences''' refers to a specification of recursive [[utility]].
 
A recursive utility function can be constructed from two components: a time aggregator that characterizes preferences in the absence of uncertainty and a risk aggregator that defines the certainty equivalent function that characterizes preferences over static gambles and is used to aggregate the risk associated with future utility. With Epstein–Zin preferences, the time aggregator is a linearly homogenous [[CES aggregate]] of current consumption and the certainty equivalent of future utility. Specifically, the date-t utility index, <math>U_t</math>, for a sequence of positive scalar consumptions <math>\{c_t, c_{t+1}, c_{t+2}, ...\}</math>, that are potentially stochastic for time periods beyond date t, is defined recursively as the solution to the nonlinear stochastic difference equation
:<math>
U_t = [ (1-\beta) c_t^\rho + \beta \mu_t(U_{t+1})^\rho ]^{1/\rho} ,
</math>
where <math>\mu_t( )</math> is a real-valued certainty equivalent operator. The parameter <math>0<\beta<1</math> determines the marginal rate of time preference, <math>1/\beta -1</math>, and the parameter <math>\rho<1</math> determines the elasticity of intertemporal substitution, <math>1/(1-\rho)</math>. Epstein and Zin considered a variety of certainty equivalent operators, but a popular choice for both theoretical and empirical research has been <math>\mu_t(U_{t+1})=[E_t U_{t+1}^\alpha]^{1/\alpha}</math>, where <math>E_t</math> denotes the expected value of probability distribution of <math>U_{t+1}</math>, conditional on information available to the planner in date t. The parameter <math>\alpha < 1</math> encodes risk aversion, with smaller values of <math>\alpha</math> implying a stronger aversion to risk.  The parameter restriction <math>\alpha=\rho</math> results in a time-additive [[Von Neumann–Morgenstern utility theorem|von Neumann–Morgenstern]] expected utility index.
 
==References==
* {{cite journal |title=Substitution, Risk Aversion, and the Temporal Behavior of Consumption and Asset Returns: A Theoretical Framework |last=Epstein |first=Larry G. |authorlink2=Stan Zin |last2=Zin |first2=Stanley E. |journal=[[Econometrica]] |volume=57 |issue=4 |year=1989 |pages=937–969 |doi= |jstor=1913778 }}
* {{cite book |chapter=Recursive Preferences |last=Backus |first=David K. |last2=Routledge |first2=Bryan R. |last3=Zin |first3=Stanley E. |title=[[The New Palgrave Dictionary of Economics]] |edition=Second |editor1-first=Steven N. |editor1-last=Durlauf |editor2-first=Lawrence E. |editor2-last=Blume |publisher=Palgrave Macmillan |year=2008 |chapterurl=http://www.dictionaryofeconomics.com/article?id=pde2008_R000260 }}
 
{{DEFAULTSORT:Epstein-Zin preferences}}
[[Category:Microeconomics]]
[[Category:Consumer theory]]
 
 
{{microeconomics-stub}}

Revision as of 13:12, 28 January 2014

30 year-old Entertainer or Range Artist Wesley from Drumheller, really loves vehicle, property developers properties for sale in singapore singapore and horse racing. Finds inspiration by traveling to Works of Antoni Gaudí. In economics, Epstein–Zin preferences refers to a specification of recursive utility.

A recursive utility function can be constructed from two components: a time aggregator that characterizes preferences in the absence of uncertainty and a risk aggregator that defines the certainty equivalent function that characterizes preferences over static gambles and is used to aggregate the risk associated with future utility. With Epstein–Zin preferences, the time aggregator is a linearly homogenous CES aggregate of current consumption and the certainty equivalent of future utility. Specifically, the date-t utility index, Ut, for a sequence of positive scalar consumptions {ct,ct+1,ct+2,...}, that are potentially stochastic for time periods beyond date t, is defined recursively as the solution to the nonlinear stochastic difference equation

Ut=[(1β)ctρ+βμt(Ut+1)ρ]1/ρ,

where μt() is a real-valued certainty equivalent operator. The parameter 0<β<1 determines the marginal rate of time preference, 1/β1, and the parameter ρ<1 determines the elasticity of intertemporal substitution, 1/(1ρ). Epstein and Zin considered a variety of certainty equivalent operators, but a popular choice for both theoretical and empirical research has been μt(Ut+1)=[EtUt+1α]1/α, where Et denotes the expected value of probability distribution of Ut+1, conditional on information available to the planner in date t. The parameter α<1 encodes risk aversion, with smaller values of α implying a stronger aversion to risk. The parameter restriction α=ρ results in a time-additive von Neumann–Morgenstern expected utility index.

References

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