Ambiguity Aversion,Robustness, and the Variational Representation of Preferences |
| |
Authors: | Fabio Maccheroni Massimo Marinacci Aldo Rustichini |
| |
Abstract: | We characterize, in the Anscombe–Aumann framework, the preferences for which there are a utility functionu on outcomes and an ambiguity indexc on the set of probabilities on the states of the world such that, for all acts f and g, . The function u represents the decision maker's risk attitudes, while the index c captures his ambiguity attitudes. These preferences include the multiple priors preferences of Gilboa and Schmeidler and the multiplier preferences of Hansen and Sargent. This provides a rigorous decision‐theoretic foundation for the latter model, which has been widely used in macroeconomics and finance. |
| |
Keywords: | Ambiguity aversion model uncertainty robustness |
|
|