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Optimal Expectations

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Author Info
Jonathan Parker
Markus K Brunnermeier

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Abstract

This paper introduces a tractable, structural model of subjective beliefs. Since agents that plan for the future care about expected future utility flows, current felicity can be increased by believing that better outcomes are more likely. On the other hand, expectations that are biased towards optimism worsen decision making, leading to poorer realized outcomes on average. Optimal expectations balance these forces by maximizing the total well-being of an agent over time. We apply our framework of optimal expectations to three different economic settings. In a portfolio choice problem, agents overestimate the return of their investment and underdiversify. In general equilibrium, agents' prior beliefs are endogenously heterogeneous, leading to gambling. Second, in a consumption-saving problem with stochastic income, agents are both overconfident and overoptimistic, and consume more than implied by rational beliefs early in life. Third, in choosing when to undertake a single task with an uncertain cost, agents exhibit several features of procrastination, including regret, inter-temporal preference reversal, and a greater readiness to accept commitment.

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Paper provided by Financial Markets Group in its series FMG Discussion Papers with number dp434.

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Date of creation: Dec 2002
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Handle: RePEc:fmg:fmgdps:dp434

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Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
  1. Roland Bénabou & Jean Tirole, 2002. "Self-Confidence And Personal Motivation," The Quarterly Journal of Economics, MIT Press, vol. 117(3), pages 871-915, August. [Downloadable!] (restricted)
  2. Andrew Caplin & John Leahy, 2001. "Psychological Expected Utility Theory And Anticipatory Feelings," The Quarterly Journal of Economics, MIT Press, vol. 116(1), pages 55-79, February. [Downloadable!] (restricted)
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  3. Barsky, Robert B, et al, 1997. "Preference Parameters and Behavioral Heterogeneity: An Experimental Approach in the Health and Retirement Study," The Quarterly Journal of Economics, MIT Press, vol. 112(2), pages 537-79, May.
  4. Leeat Yariv, 2002. "I'll See It When I Believe It - A Simple Model of Cognitive Consistency," Cowles Foundation Discussion Papers 1352, Cowles Foundation, Yale University. [Downloadable!]
  5. Akerlof, George A & Dickens, William T, 1982. "The Economic Consequences of Cognitive Dissonance," American Economic Review, American Economic Association, vol. 72(3), pages 307-19, June. [Downloadable!] (restricted)
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