One Smart Agent
58 Pages Posted: 11 Jul 2008
Date Written: December 1995
This paper proposes an equilibrium concept for a class of games in which players make irreversible costly decisions; these games have been widely used in the recent I.O. literature. The equilibrium concept is defined, not in the space of strategies, but in the space of (observable outcomes). It is weaker than perfect Nash equilibrium, and involves combining a form of ?survivor principle? with an assumption regarding entry. This assumption involves only a very weak rationality requirement: if a profitable opportunity exists in the market, there is ?One smart agent ? who will find it. This weak equilibrium concept is sufficient to imply some empirically interesting regularities in the area of market structure.
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