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Set-rationalizable choice and self-stability

  • Brandt, Felix
  • Harrenstein, Paul
Registered author(s):

    Rationalizability and similar notions of consistency have proved to be highly problematic in the context of social choice, as witnessed by a range of impossibility results, among which Arrow[modifier letter apostrophe]s is the most prominent. We propose to rationalize choice functions by preference relations over sets of alternatives (set-rationalizability) and introduce two consistency conditions, and , which are defined in analogy to Sen[modifier letter apostrophe]s [alpha] and [gamma]. We find that a choice function satisfies if and only if it is set-rationalizable and that it satisfies and if and only if it is self-stable, a new concept based on earlier work by Dutta. The class of self-stable social choice functions contains a number of appealing Condorcet extensions.

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

    Volume (Year): 146 (2011)
    Issue (Month): 4 (July)
    Pages: 1721-1731

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    Handle: RePEc:eee:jetheo:v:146:y:2011:i:4:p:1721-1731
    Contact details of provider: Web page: http://www.elsevier.com/locate/inca/622869

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