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Unanimous Implementation: A Case For Approval Mechanisms

Author

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  • Matias Nunez

    (Université Paris Dauphine-PSL - PSL - Université Paris Sciences et Lettres)

  • Dimitrios Xefteris

    (UCY - University of Cyprus [Nicosia])

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.science/hal-01270275v2
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    References listed on IDEAS

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    Keywords

    Indirect Mechanisms ; Nash Implementation; Strategy-proof; Unanimity;
    All these keywords.

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