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On the Equivalence of Bayesian and Dominant Strategy Implementation

Author

Listed:
  • Alex Gershkov
  • Jacob Goeree
  • Alexey Kushnir
  • Benny Moldovanu
  • Xianwen Shi

Abstract

We consider a standard social choice environment with linear utilities and independent, one-dimensional, private types. We prove that for any Bayesian incentive compatible mechanism there exists an equivalent dominant strategy incentive compatible mechanism that delivers the same interim expected utilities for all agents and the same ex ante expected social surplus. The short proof is based on an extension of an elegant result due to Gutmann et al. (Annals of Probability, 1991). We also show that the equivalence between Bayesian and dominant strategy implementation generally breaks down when the main assumptions underlying the social choice model are relaxed, or when the equivalence concept is strengthened to apply to interim expected allocations.

Suggested Citation

  • Alex Gershkov & Jacob Goeree & Alexey Kushnir & Benny Moldovanu & Xianwen Shi, 2012. "On the Equivalence of Bayesian and Dominant Strategy Implementation," Working Papers tecipa-445, University of Toronto, Department of Economics.
  • Handle: RePEc:tor:tecipa:tecipa-445
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    References listed on IDEAS

    as
    1. Jacob K. Goeree & Alexey Kushnir, 2011. "On the equivalence of Bayesian and dominant strategy implementation in a general class of social choice problems," ECON - Working Papers 021, Department of Economics - University of Zurich.
    2. Dirk Bergemann & Stephen Morris, 2005. "Robust Mechanism Design," Econometrica, Econometric Society, vol. 73(6), pages 1771-1813, November.
    3. Hernando-Veciana, Ángel & Michelucci, Fabio, 2011. "Second best efficiency and the English auction," Games and Economic Behavior, Elsevier, vol. 73(2), pages 496-506.
    4. Muller, Rudolf & Perea, Andres & Wolf, Sascha, 2007. "Weak monotonicity and Bayes-Nash incentive compatibility," Games and Economic Behavior, Elsevier, vol. 61(2), pages 344-358, November.
    5. Alejandro M. Manelli & Daniel R. Vincent, 2010. "Bayesian and Dominant‐Strategy Implementation in the Independent Private‐Values Model," Econometrica, Econometric Society, vol. 78(6), pages 1905-1938, November.
    Full references (including those not matched with items on IDEAS)

    More about this item

    Keywords

    Bayesian Implementation; Dominant Strategy Implementation; Equivalence;

    JEL classification:

    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design

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