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Unanimous Implementation: A Case For Approval Mechanisms

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  • Matias Nunez

    (Université Paris-Dauphine)

  • Dimitrios Xefteris

    (University of Cyprus [Nicosia] - University of Cyprus)

Abstract

We design the class of (indirect) Approval mechanisms which allow the players’ strategies to coincide with the subsets of the outcome space. By focusing on the single-peaked domain, we prove that: a) Each of these mechanisms is characterized by a unique equilibrium outcome, and b) for almost every implementable welfare optimum (outcome of a social choice rule), including the Condorcet winner alternative, there exists an Approval mechanism that unanimously implements it. That is, Approval mechanisms help a society achieve every feasible welfare goal, and, perhaps more importantly, they promote social coherence: The implemented outcome is approved by everyone.

Suggested Citation

  • Matias Nunez & Dimitrios Xefteris, 2016. "Unanimous Implementation: A Case For Approval Mechanisms," Working Papers hal-01270275, HAL.
  • Handle: RePEc:hal:wpaper:hal-01270275
    Note: View the original document on HAL open archive server: https://hal.archives-ouvertes.fr/hal-01270275v2
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    References listed on IDEAS

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    1. Saporiti, Alejandro, 2009. "Strategy-proofness and single-crossing," Theoretical Economics, Econometric Society, vol. 4(2), June.
    2. Cason, Timothy N. & Saijo, Tatsuyoshi & Sjostrom, Tomas & Yamato, Takehiko, 2006. "Secure implementation experiments: Do strategy-proof mechanisms really work?," Games and Economic Behavior, Elsevier, vol. 57(2), pages 206-235, November.
    3. Arribillaga, R. Pablo & Massó, Jordi, 2016. "Comparing generalized median voter schemes according to their manipulability," Theoretical Economics, Econometric Society, vol. 11(2), May.
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    Keywords

    Indirect Mechanisms ; Nash Implementation; Strategy-proof; Unanimity;

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