Ambiguous Social Choice Functions

Abstract: Call a mechanism that associates each profile of preferences of voters to an ambiguous act an Ambiguous Social Choice Function (ASCF). This study provides a full characterization of the set of unanimous and strategyproof ASCFs. We discover a new class of social choice functions that are unanimous, strategyproof, but also anonymous.

Keywords: Social choice function, Ambiguity Aversion, Ellsberg Urns, Strategy-proofness, Unanimity

JEL classification: D71, D72, D81, D82