Seminario 18/02: Jordi Massó (Universitat Autónoma de Barcelona) – Not all majority-based social choice functions are obviously strategy-proof

Información

Abstract

We consider two families of strategy-proof social choice functions based on the majority principle: extended majority voting rules on the universal domain of preferences over two alternatives and generalized median voter schemes on the domain of single-peaked preferences over a finite and linearly ordered set of alternatives. We characterize their respective subclasses of obviously strategy-proof social choice functions, which are substantially smaller than their corresponding strategy-proof classes, and for each one of those social choice functions we identify an extensive game form that implements it in obviously dominant strategies.