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We dedicate this paper—an extended version of which was previously circulated with the title ''Ambiguity from the Differential Viewpoint''—to Erio Castagnoli on the occasion of his 60th birthday. Abstract The objective of this paper is to show how ambiguity, and a decision maker (DM)'s response to it, can be modelled formally in the context of a general(More)
We introduce a general model of static choice under uncertainty, arguably the weakest model achieving a separation of cardinal utility and a unique representation of beliefs. Most of the nonex-pected utility models existing in the literature are special cases of it. Such separation is motivated by the view that tastes are constant, whereas beliefs change(More)
We introduce and axiomatize dynamic variational preferences, the dynamic version of the variational preferences we axiomatized in [21], which generalize the multiple priors preferences of Gilboa and Schmeidler [9], and include the Multiplier Preferences inspired by robust control and first used in macroeconomics by Hansen and Sargent (see [11]), as well as(More)
A decision maker is characterized by two binary relations. The first reflects decisions that are rational in an " objective " sense: the decision maker can convince others that she is right in making them. The second relation models decisions that are rational in a " subjective " sense: the decision maker cannot be convinced that she is wrong in making(More)