Robust Implementation in General Mechanisms

Dirk Bergemann () and Stephen Morris ()

No 1666, Cowles Foundation Discussion Papers from Cowles Foundation, Yale University

Abstract: A social choice function is robustly implemented if every equilibrium on every type space achieves outcomes consistent with it. We identify a robust monotonicity condition that is necessary and (with mild extra assumptions) sufficient for robust implementation. Robust monotonicity is strictly stronger than both Maskin monotonicity (necessary and almost sufficient for complete information implementation) and ex post monotonicity (necessary and almost sufficient for ex post implementation). It is equivalent to Bayesian monotonicity on all type spaces.

Keywords: Mechanism design; Implementation; Robustness; Common knowledge; Interim equilibrium; Dominant strategies (search for similar items in EconPapers)
JEL-codes: C79 D82 (search for similar items in EconPapers)
New Economics Papers: this item is included in nep-cta and nep-gth
Date: 2008-06
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