Nash Implementation in Private Good Economies with Single-Plateaued Preferences

Abstract: In this paper we explore the problem of Nash implementation providing new sufficient conditions called I-monotonicity and I-weak no-veto power. Firstly, we show that these conditions together with unanimity are sufficient for the implementation of social choice correspondences (SCCs) in Nash equilibria. Secondly, we prove that, in the domain of the private good economies with single-plateaued preferences, a solution of the problem of fair division is Nash implementable if and only if it satisfies Maskin monotonicity. We provide examples of SCCs satisfying or not Maskin monotonicity.