Favor exchange with private costs: An experiment

• 成果类型: Article
• 署名作者: Degan, Arianna; Li, Yushen; Xie, Huan
• 署名单位: University of Quebec; University of Quebec Montreal; Jinan University; Concordia University - Canada; Universite de Montreal; Universite de Montreal
• 刊物名称: GAMES AND ECONOMIC BEHAVIOR
• ISSN/ISSBN: 0899-8256
• DOI: 10.1016/j.geb.2025.05.011
• 发表日期: 2025
• 页码: 94-112
• 关键词: Favor exchange; Indefinitely repeated games; incomplete information; Strategy estimation; Strategy fitting

摘要

We conduct an experiment on a two-player infinitely repeated favor exchange game. In the stage game, each player decides whether to provide a favor to the other player. A favor generates a fixed benefit for the recipient and a cost for the provider, which can be either low or high. We study the situation where this cost is private information and it is efficient to provide a favor only when the cost is low. We address two general questions: 1) To what extent do subjects exchange favors in ways that are payoff enhancing, given that private information hinders exchanging favors efficiently? 2) Which strategies do subjects choose and what are the driving forces behind their choices? We focus on Stationary Strongly Symmetric (SSS) strategies, where players play the same strategy after any history, and Equality Matching (EM) strategies, where subjects keep track of the net tallies of favors. We find that overall subjects exchange favors to a relatively large extent and achieve an average payoff-efficiency index exceeding 60%. Although simple strategies, as SSS, are played with the highest frequency, more complex strategies, as EM, explain an important proportion of the data. Subjects' behavior is not always consistent with incentive compatibility or driven by the attainment of higher ex-ante payoffs. The results also suggest that rewarding subjects for trusting and reciprocating might be more acceptable than requiring them to take very costly actions on the equilibrium path, even when it is overall payoff enhancing.