Allais, Ellsberg, and Preferences for Hedging

Brown Economics Working Paper

44 Pages Posted: 22 Mar 2012

See all articles by Mark Dean

Mark Dean

New York University (NYU) - Department of Economics; Brown University - Department of Economics

Pietro Ortoleva

Princeton University - Department of Economics

Multiple version iconThere are 2 versions of this paper

Date Written: February 14, 2012

Abstract

We study the relation between ambiguity aversion and the Allais paradox. To this end, we introduce a novel definition of hedging which applies to objective lotteries as well as to uncertain acts, and we use it to define a novel axiom that captures a preference for hedging which generalizes the one of Schmeidler (1989). We argue how this generalized axiom captures both aversion to ambiguity, and attraction towards certainty for objective lotteries. We show that this axiom, together with other standard ones, is equivalent to two representations both of which generalize the MaxMin Expected Utility model of Gilboa and Schmeidler (1989). In both, the agent reacts to ambiguity using multiple priors, but does not use expected utility to evaluate objective lotteries. In our first representation, the agent treats objective lotteries as 'ambiguous objects,' and use a set of priors to evaluate them. In the second, equivalent representation, lotteries are evaluated by distorting probabilities as in the Rank-Dependent Utility model, but using the worst from a set of such distortions. Finally, we show how a preference for hedging is not sufficient to guarantee an Ellsberg-like behavior if the agent violate expected utility for objective lotteries. We then provide an axiom that guarantees that this is the case, and find an associated representation in which the agent first maps acts to an objective lottery using the worst of the priors in a set; then evaluates this lottery using the worst distortion from a set of concave Rank-Dependent Utility functionals.

Keywords: Ambiguity Aversion, Allais Paradox, Ellsberg Paradox, Hedging, Multiple Priors

JEL Classification: D81

Suggested Citation

Dean, Mark R. W. and Dean, Mark R. W. and Ortoleva, Pietro, Allais, Ellsberg, and Preferences for Hedging (February 14, 2012). Brown Economics Working Paper, Available at SSRN: https://ssrn.com/abstract=2026630 or http://dx.doi.org/10.2139/ssrn.2026630

Mark R. W. Dean (Contact Author)

New York University (NYU) - Department of Economics ( email )

269 Mercer Street, 7th Floor
New York, NY 10011
United States

Brown University - Department of Economics ( email )

64 Waterman Street
Providence, RI 02912
United States

HOME PAGE: http://www.econ.brown.edu/fac/Mark_Dean/

Pietro Ortoleva

Princeton University - Department of Economics ( email )

Princeton, NJ 08544-1021
United States

Do you have negative results from your research you’d like to share?

Paper statistics

Downloads
110
Abstract Views
1,070
Rank
290,726
PlumX Metrics