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arXiv 1111.6156cs.GT
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拥挤博弈中的贪婪与均衡

Greediness and Equilibrium in Congestion Games

Sergey Kuniavsky, Rann Smorodinsky

摘要:

Rosenthal(1973)引入了拥塞博弈类,并证明了它们在纯策略下总是存在一个纳什均衡。Fotakis et al.(2005)引入了贪婪策略元组的概念,其中参与者顺序地并且可重复地选择一个策略,该策略是对前参与者选择的策略的最佳反应。前一种解决方案的概念是由对参与者的理性及其常识的强烈假设驱动的,而后者对参与者的行为假设很少。从Fotakis \cite{fotakis10}可以得出,对于树可表示拥塞博弈,贪婪行为导致NE。本文给出了这两个解概念等价的充要条件。这种等同性增强了这些概念作为环境的现实结果的可行性。单调对称博弈出现这种等价的条件是策略集具有树形,或者等价地是一个“扩张并行图”。

英文摘要:

Rosenthal (1973) introduced the class of congestion games and proved that they always possess a Nash equilibrium in pure strategies. Fotakis et al. (2005) introduce the notion of a greedy strategy tuple, where players sequentially and irrevocably choose a strategy that is a best response to the choice of strategies by former players. Whereas the former solution concept is driven by strong assumptions on the rationality of the players and the common knowledge thereof, the latter assumes very little rationality on the players' behavior. From Fotakis \cite{fotakis10} it follows that for Tree Representable congestion Games greedy behavior leads to a NE. In this paper we obtain necessary and sufficient conditions for the equivalence of these two solution concepts. Such equivalence enhances the viability of these concepts as realistic outcomes of the environment. The conditions for such equivalence to emerge for monotone symmetric games is that the strategy set has a tree-form, or equivalently is a `extension-parallel graph'.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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