Weak monotonicity suffices for truthfulness on convex domains

  • Authors:
  • Michael Saks;Lan Yu

  • Affiliations:
  • Rutgers University, Piscataway, NJ;Rutgers University, Piscataway, NJ

  • Venue:
  • Proceedings of the 6th ACM conference on Electronic commerce
  • Year:
  • 2005

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Abstract

Weak monotonicity is a simple necessary condition for a social choice function to be implementable by a truthful mechanism. Roberts [10] showed that it is sufficient for all social choice functions whose domain is unrestricted. Lavi, Mu'alem and Nisan [6] proved the sufficiency of weak monotonicity for functions over order-based domains and Gui, Muller and Vohra [5] proved sufficiency for order-based domains with range constraints and for domains defined by other special types of linear inequality constraints. Here we show the more general result, conjectured by Lavi, Mu'alem and Nisan [6], that weak monotonicity is sufficient for functions defined on any convex domain.