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arXiv 2604.28186cs.GTcs.AIcs.CCcs.LGecon.TH
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在单方面偏离之外计算均衡

Computing Equilibrium beyond Unilateral Deviation

LIDS, EECS, Massachusetts Institute of Technology(LIDS电子工程系,麻省理工学院)

Mingyang Liu, Gabriele Farina, Asuman Ozdaglar

AI总结:

本文提出一种新的均衡概念,通过最小化联盟偏离激励来保证存在性,针对平均收益和最大内联盟收益扩展框架,并证明计算此类均衡的复杂性下界。

摘要:

大多数熟悉的均衡概念,如纳什均衡和相关均衡,仅保证单个玩家无法通过单方面偏离提高效用。它们不提供对联盟有利可图协同偏离的保证。尽管文献中提出了提供多方面偏离稳定性的解决方案概念(例如,强纳什均衡和联盟证明均衡),但这些通常不存在。本文研究了一种替代的解决方案概念,该概念最小化联盟偏离激励,而不是要求其消失,因此保证存在。具体来说,我们专注于最小化偏离联盟的平均收益,并将框架扩展到加权平均收益和最大内联盟收益。相比之下,最小收益的类比被证明计算上不可行。对于平均收益和最大收益目标,我们证明了计算此类均衡的复杂性下界,并提出了一个与该下界匹配的算法。最后,我们使用该框架解决“剥削福利前沿”(EWF),即在给定剥削性(所有单方面偏离的最大收益)下可达到的最大社会福利。

英文摘要:

Most familiar equilibrium concepts, such as Nash and correlated equilibrium, guarantee only that no single player can improve their utility by deviating unilaterally. They offer no guarantees against profitable coordinated deviations by coalitions. Although the literature proposes solution concepts that provide stability against multilateral deviations (\emph{e.g.}, strong Nash and coalition-proof equilibrium), these generally fail to exist. In this paper, we study an alternative solution concept that minimizes coalitional deviation incentives, rather than requiring them to vanish, and is therefore guaranteed to exist. Specifically, we focus on minimizing the average gain of a deviating coalition, and extend the framework to weighted-average and maximum-within-coalition gains. In contrast, the minimum-gain analogue is shown to be computationally intractable. For the average-gain and maximum-gain objectives, we prove a lower bound on the complexity of computing such an equilibrium and present an algorithm that matches this bound. Finally, we use our framework to solve the \emph{Exploitability Welfare Frontier} (EWF), the maximum attainable social welfare subject to a given exploitability (the maximum gain over all unilateral deviations).

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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