Evolution of Conformity in Social Dilemmas

PloS One
Yali DongBoyu Zhang

Abstract

People often deviate from their individual Nash equilibrium strategy in game experiments based on the prisoner's dilemma (PD) game and the public goods game (PGG), whereas conditional cooperation, or conformity, is supported by the data from these experiments. In a complicated environment with no obvious "dominant" strategy, conformists who choose the average strategy of the other players in their group could be able to avoid risk by guaranteeing their income will be close to the group average. In this paper, we study the repeated PD game and the repeated m-person PGG, where individuals' strategies are restricted to the set of conforming strategies. We define a conforming strategy by two parameters, initial action in the game and the influence of the other players' choices in the previous round. We are particularly interested in the tit-for-tat (TFT) strategy, which is the well-known conforming strategy in theoretical and empirical studies. In both the PD game and the PGG, TFT can prevent the invasion of non-cooperative strategy if the expected number of rounds exceeds a critical value. The stability analysis of adaptive dynamics shows that conformity in general promotes the evolution of cooperation, and that a regime of cooper...Continue Reading

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Citations

Apr 20, 2017·Proceedings of the National Academy of Sciences of the United States of America·Christian HilbeMartin A Nowak
May 11, 2016·Scientific Reports·Seung Ki BaekMartin A Nowak
Oct 5, 2016·PloS One·Christian HilbeManfred Milinski
Aug 16, 2019·Nature·Oliver P HauserMartin A Nowak
May 23, 2019·Scientific Reports·Yinhai FangHaiyan Xu

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