One Smart Agent
针对一类玩家做出不可逆成本决策的博弈提出了一种均衡概念，该概念弱于完美纳什均衡，仅需假设存在一个聪明的代理人能发现盈利机会，即可推导出市场结构中的经验规律。
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.