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Aggregating Tastes, Beliefs, and Attitudes under Uncertainty

Authors: Danan, Eric; Gajdos, Thibault; Hill, Brian; Tallon, Jean-Marc;

Aggregating Tastes, Beliefs, and Attitudes under Uncertainty

Abstract

We provide possibility results on the aggregation of beliefs and tastes for Monotone, Bernoullian and Archimedian preferences of Cerreia-Vioglio, Ghirardato, Maccheroni, Marinacci and Siniscalchi (2011). We propose a new axiom, Unambiguous Pareto Dominance, which requires that if the unambiguous part of individuals' preferences over a pair of acts agree, then society should follow them. We characterize the resulting social preferences and show that it is enough that individuals share a prior to allow non dictatorial aggregation. A further weakening of this axiom on common-taste acts, where cardinal preferences are identical, is also characterized. It gives rise to a set of relevant priors at the social level that can be any subset of the convex hull of the individuals' sets of relevant priors. We then apply these general results to the Maxmin Expected Utility model, the Choquet Expected Utility model and the Smooth Ambiguity model. We end with a characterization of the aggregation of ambiguity attitudes.

Country
France
Keywords

Uncertainty, Preference Aggregation, Social Choice, [SHS.ECO] Humanities and Social Sciences/Economics and Finance

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