Implementation Via Approval Mechanisms
Nunez, Matias; Xefteris, Dimitrios (2017), Implementation Via Approval Mechanisms, Journal of Economic Theory, 170, p. 169-181. 10.1016/j.jet.2017.05.003
TypeArticle accepté pour publication ou publié
Journal nameJournal of Economic Theory
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Laboratoire d'analyse et modélisation de systèmes pour l'aide à la décision [LAMSADE]
Abstract (EN)We focus on the single-peaked domain and study the class of Generalized Approval Mechanisms (GAMs): First, players simultaneously select subsets of the outcome space and scores are assigned to each alternative; and, then, a given quantile of the induced score distribution is implemented. Our main finding is that essentially for every Nash-implementable welfare optimum – including the Condorcet winner alternative – there exists a GAM that Nash-implements it. Importantly, the GAM that Nash-implements the Condorcet winner alternative is the first simple simultaneous game with this feature in the literature.
Subjects / KeywordsNash Implementation; Strategy-proofness; Approval Voting; Single-Peakedness; Condorcet winner
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