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Dominance and Belief Potential

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  • Morris, Stephen
  • Rob, Rafael
  • Shin, Hyun Song

Abstract

This paper elucidates on the logic behind recent papers which show that a unique equilibrium is selected in the presence of higher order uncertainty, i.e., when players lack common knowledge. We introduce two new concepts: stochastic potential of the information system and p-dominance of Nash-equilibria of the game, and show that a Nash-equilibrium is uniquely selected whenever its p-dominance is below the stochastic potential. This criterion applies to many-action games, not merely 2 by 2 games. It also applies to games without dominant strategies, where the set of equilibria is shown to be smaller and simpler than might be initially conjectured. Finally, the new concepts help understand the circumstances under which the set of equilibria varies with the amount of common knowledge among players. Copyright 1995 by The Econometric Society.

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  • Morris, Stephen & Rob, Rafael & Shin, Hyun Song, 1995. "Dominance and Belief Potential," Econometrica, Econometric Society, vol. 63(1), pages 145-157, January.
    • Handle: RePEc:ecm:emetrp:v:63:y:1995:i:1:p:145-57
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