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arXiv 2212.13619cs.GT
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近似贝叶斯二次说服(扩展版)

Almost-Bayesian Quadratic Persuasion (Extended Version)

Olivier Massicot, Cédric Langbort

AI总结:

本文放宽了 Bayesian Persuasion 模型的贝叶斯性假设,在效用为二次且先验各向同性时,证明 Alice 的最优响应不再线性,但推导出线性策略近似最优的界限,并指出 Bob 越偏离贝叶斯性,Alice 共享的信息越少。

摘要:

在本文中,我们放宽了 Kamenica & Gentzkow 提出的现已传统的 Bayesian Persuasion 模型中的贝叶斯性假设。现有的方法在处理接收者(Bob)可能是非贝叶斯的情况时,通常假设其思维过程虽非贝叶斯但对发送者(Alice)是已知的,可能仅取决于某个参数;与之不同的是,我们让 Alice 仅仅假设 Bob 在某种意义上表现得“几乎像”一个贝叶斯智能体,而不依赖任何特定的模型。在这一假设下,我们研究了当双方的效用函数均为二次且先验分布为各向同性时 Alice 的策略。我们表明,与贝叶斯情况相反,Alice 的最优响应可能不再是线性的。这一事实令人遗憾,因为线性策略仍然是唯一能够确定其诱导信念分布的策略。此外,评估线性策略被证明是困难的,仅在特定情况下可行,更不用说寻找最优策略了。尽管如此,我们推导出了证明线性策略是近似最优的界限,并允许 Alice 通过数值方法计算出近似最优的线性策略。有了这一解决方案,我们证明了随着 Bob 偏离贝叶斯性的程度增加,Alice 会向 Bob 共享更少的信息,这极大地损害了 Bob 的利益。

英文摘要:

In this article, we relax the Bayesianity assumption in the now-traditional model of Bayesian Persuasion introduced by Kamenica & Gentzkow. Unlike preexisting approaches -- which have tackled the possibility of the receiver (Bob) being non-Bayesian by considering that his thought process is not Bayesian yet known to the sender (Alice), possibly up to a parameter -- we let Alice merely assume that Bob behaves 'almost like' a Bayesian agent, in some sense, without resorting to any specific model. Under this assumption, we study Alice's strategy when both utilities are quadratic and the prior is isotropic. We show that, contrary to the Bayesian case, Alice's optimal response may not be linear anymore. This fact is unfortunate as linear policies remain the only ones for which the induced belief distribution is known. What is more, evaluating linear policies proves difficult except in particular cases, let alone finding an optimal one. Nonetheless, we derive bounds that prove linear policies are near-optimal and allow Alice to compute a near-optimal linear policy numerically. With this solution in hand, we show that Alice shares less information with Bob as he departs more from Bayesianity, much to his detriment.

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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