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Strategyproof choice of acts: beyond dictatorship

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  • BAHEL, Eric
  • SPRUMONT, Yves

Abstract

We model social choices as acts mapping states of nature to (public) outcomes. A social choice function (or SCF) assigns an act to every profile of subjective expected utility preferences over acts. A SCF is strategyproof if no agent ever has an incentive to misrepresent her beliefs about the states of nature or her valuation of the outcomes; it is ex-post efficient if the act selected at any given preference profile picks a Pareto-efficient outcome in every state of nature. We offer a complete characterization of all strategyproof and ex-post efficient SCFs. The chosen act must pick the most preferred outcome of some (possibly different) agent in every state of nature. The set of states in which an agent's top outcome is selected may vary with the reported belief profile; it is the union of all the states assigned to her by a collection of bilaterally dictatorial and bilaterally consensual assignment rules.

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  • BAHEL, Eric & SPRUMONT, Yves, 2017. "Strategyproof choice of acts: beyond dictatorship," Cahiers de recherche 2017-01, Universite de Montreal, Departement de sciences economiques.
    • Handle: RePEc:mtl:montde:2017-01
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    More about this item

    Keywords

    Social choice under uncertainty; strategyproofness; subjective expected utility; dictatorship; consensuality; bilaterality;
    All these keywords.

    JEL classification:

    • D71 - Microeconomics - - Analysis of Collective Decision-Making - - - Social Choice; Clubs; Committees; Associations

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