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Individual versus group strategy-proofness: When do they coincide?

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  • Barberà, Salvador
  • Berga, Dolors
  • Moreno, Bernardo

Abstract

A social choice function is group strategy-proof on a domain if no group of agents can manipulate its final outcome to their own benefit by declaring false preferences on that domain. There are a number of economically significant domains where interesting rules satisfying individual strategy-proofness can be defined, and for some of them, all these rules turn out to also satisfy the stronger requirement of group strategy-proofness. We provide conditions on domains guaranteeing that for all rules defined on them, individual and group strategy-proofness become equivalent. We also provide a partial answer regarding the necessity of our conditions.

Suggested Citation

  • Barberà, Salvador & Berga, Dolors & Moreno, Bernardo, 2010. "Individual versus group strategy-proofness: When do they coincide?," Journal of Economic Theory, Elsevier, vol. 145(5), pages 1648-1674, September.
  • Handle: RePEc:eee:jetheo:v:145:y:2010:i:5:p:1648-1674
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    More about this item

    Keywords

    Strategy-proofness Group strategy-proofness Sequential inclusion Single-peaked preferences Separable preferences;

    JEL classification:

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

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