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“Time Lotteries and Stochastic Impatience”by Dr. David Dillenberger
19Nov

“Time Lotteries and Stochastic Impatience”by Dr. David Dillenberger

Monday,19 November 2018 | 4:30 p.m. - 6 p.m.
Room 910, K.K. Leung Building, HKU
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Economics Seminar
Author:
  • David Dillenberger
    University of Pennsylvania

 

We  study  preferences over lotteries that  pay a fixed prize at an uncertain future date: what we call time lotteries.  The standard model of risk and time preferences, Expected Discounted Utility, implies that  individuals must be risk seeking  towards such lotteries (RSTL). In contrast, we show experimentally that almost all subjects violate this property. Our main contributions are theoretical. First, we show that risk aversion over time lotteries can be captured by a generalization of Expected Discounted Utility that  is obtained by keeping the behavioral postulates of Discounted Utility and Expected Utility. Second, we introduce a new property termed Stochastic Impatience, a risky counterpart of standard Impatience, and show that not only the model above, but also substantial generalizations that allow for non-Expected Utility and non-exponential discounting, cannot jointly accommodate it and even a single instance of risk aversion over time lotteries (or, equivalently, any violation of RSTL), showing a fundamental tension between the two.

 

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“Time Lotteries and Stochastic Impatience”by Dr. David Dillenberger
Monday,19 November 20184:30 p.m. - 6 p.m.
Room 910, K.K. Leung Building, HKU
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