Time-Consistency of Indifference Prices and Monetary Utility Functions

21 Pages Posted: 22 Jan 2006

Date Written: January 16, 2006

Abstract

We consider an economic agent with dynamic preference over a set of uncertain monetary payoffs. We assume that the agent's preferences are given by utility functions, which are updated in a time-consistent way as more information is becoming available. Our main result is that the agent's indifference prices are time-consistent if and only if his preferences can be represented with utility functions that are additive with respect to cash. We call such utility functions monetary. The proof is based on a characterization of time-consistency of dynamic utility functions in terms of indifference sets. As a special case, we obtain the result that expected utility leads to time-consistent indifference prices if and only if it is based on a linear or exponential function.

Keywords: Dynamic utility functions, time-consistency, monetary utility functions, indifference prices, indifference sets

JEL Classification: D81, D9, G12

Suggested Citation

Cheridito, Patrick and Kupper, Michael, Time-Consistency of Indifference Prices and Monetary Utility Functions (January 16, 2006). Available at SSRN: https://ssrn.com/abstract=877313 or http://dx.doi.org/10.2139/ssrn.877313

Patrick Cheridito (Contact Author)

ETH Zurich ( email )

Department of Mathematics
8092 Zurich
Switzerland

Michael Kupper

Princeton University ( email )

22 Chambers Street
Princeton, NJ 08544-0708
United States

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