• Media type: E-Article
  • Title: Strategy-proofness and single-crossing
  • Contributor: Saporiti, Alejandro [Author]
  • Published: New York, NY: The Econometric Society, 2009
  • Language: English
  • ISSN: 1555-7561
  • Keywords: D71 ; D78 ; C72 ; tops-only ; Single-crossing ; peak rules ; strategy-proofness
  • Origination:
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  • Description: This paper analyzes strategy-proof collective choice rules when individuals have single-crossing preferences on a finite and ordered set of social alternatives. It shows that a social choice rule is anonymous, unanimous, and strategy-proof on a maximal single-crossing domain if and only if it is an extended median rule with n-1 fixed ballots distributed over the individuals' most preferred alternatives. As a by-product, the paper also proves that strategy-proofness implies the tops-only property. It also offers a strategic foundation for the so-called "single-crossing version" of the Median Voter Theorem, by showing that the median ideal point can be implemented in dominant strategies by a direct mechanism in which every individual reveals his true preferences.
  • Access State: Open Access