Cooperation in an asymmetric volunteer's dilemma game with relatedness  

作　　者：HE JunZhou WANG RuiWu CHRISTOPHER X J Jensen LI YaoTang LI ChaoQian 

机构地区：[1]School of Mathematics and Statistics,Yunnan University,Kunming 650091,China [2]State Key Laboratory of Genetic Resources and Evolution,Kunming Institute of Zoology,Chinese Academy of Sciences,Kunming 650223,China [3]Department of Mathematics and Science,School of Liberal Arts and Sciences,Pratt Institute,200 Willoughby Avenue,Brooklyn,NY 11205,USA

出　　处：《Chinese Science Bulletin》2012年第16期1972-1981,共10页

基　　金：supported by the National Natural Science Foundation of China(31170408, 71161020, 10961027);the Program for Innovative Research Team (in Science and Technology) in University of Yunnan Province;the Natural Science Foundation of Yunnan Province (2009CD104);the West Light Foundation of the Chinese Academy of Sciences;the Special Fund for the Excellent Youth of the Chinese Academy of Sciences (KSCX2-EW-Q-9);the State Key Laboratory of Genetic Resources and Evolution

摘　　要：What motivates some members of a social group to voluntarily incur costs in order to provide for the common good? This question lies at the heart of theoretical and empirical studies of cooperative behavior. This is also the question that underlies the classic volunteer's dilemma model, which has been previously explored in scenarios where group members are related or interact asym- metrically. Here we present a model that combines asymmetry and relatedness, showing that the probability of volunteerism in such systems depends closely on both the degree of asymmetry and level of relatedness between interacting individuals. As has been shown in previous volunteer's dilemma models, the payoff ratio and overall group size also influence the probability of volunteerism. The probability of volunteerism decreases with increasing group size or decreasing cost-to-benefit ratio of the coplayers; in the presence of asymmetrical interactions, subordinate players were more likely to offer public goods than the dominant player. More asymmetrical interactions decrease the probability of volunteerism of the dominant player; overall volunteerism increases with increasing relatedness.What motivates some members of a social group to voluntarily incur costs in order to provide for the common good？ This question lies at the heart of theoretical and empirical studies of cooperative behavior. This is also the question that underlies the classic volunteer＇s dilemma model, which has been previously explored in scenarios where group members are related or interact asymmetrically. Here we present a model that combines asymmetry and relatedness, showing that the probability of volunteerism in such systems depends closely on both the degree of asymmetry and level of relatedness between interacting individuals. As has been shown in previous volunteer＇s dilemma models, the payoff ratio and overall group size also influence the probability of volunteerism. The probability of volunteerism decreases with increasing group size or decreasing cost-to-benefit ratio of the coplayers; in the presence of asymmetrical interactions, subordinate players were more likely to offer public goods than the dominant player. More asymmetrical interactions decrease the probability of volunteerism of the dominant player; overall volunteerism increases with increasing relatedness.

关 键 词：不对称性 志愿者 关联性 合作 游戏 相互作用 社会团体 关联程度 

分 类 号：C913.7[经济管理]