Intertemporal Utility and Correlation Aversion
AbstractConvenient assumptions about qualitative properties of the intertemporal utility function have generated counter-intuitive implications for the relationship between atemporal risk aversion and the intertemporal elasticity of substitution. If the intertemporal utility function is additively separable then the latter two concepts are the inverse of each other. We review a simple theoretical specification with a long lineage in the literature on multi-attribute utility, and demonstrate the critical role of a concept known as intertemporal risk aversion or intertemporal correlation aversion. This concept is the intertemporal analogue of a more general concept applied to two attributes of utility, but where the attributes just happen to be the time-dating of the good. In the context of intertemporal utility functions, the concept provides an intuitive explanation of possible differences between (the inverse of) atemporal risk aversion and the intertemporal elasticity of substitution. We use this theoretical structure to guide the design of a series of experiments that allow us to identify and estimate intertemporal correlation aversion. Our results show that subjects are correlation averse over lotteries with intertemporal income profiles, and that the convenient additive specification of the intertemporal utility function is not an appropriate representation of preferences over time.
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Bibliographic InfoPaper provided by Durham University Business School in its series Working Papers with number 2011_03.
Date of creation: 01 Mar 2011
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This paper has been announced in the following NEP Reports:
- NEP-ALL-2011-09-22 (All new papers)
- NEP-CBE-2011-09-22 (Cognitive & Behavioural Economics)
- NEP-EVO-2011-09-22 (Evolutionary Economics)
- NEP-EXP-2011-09-22 (Experimental Economics)
- NEP-MIC-2011-09-22 (Microeconomics)
- NEP-UPT-2011-09-22 (Utility Models & Prospect Theory)
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