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

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

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.

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Article provided by Elsevier in its journal Journal of Economic Theory.

Volume (Year): 145 (2010)
Issue (Month): 5 (September)
Pages: 1648-1674

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Handle: RePEc:eee:jetheo:v:145:y:2010:i:5:p:1648-1674
Contact details of provider: Web page: http://www.elsevier.com/locate/inca/622869

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