New insights into conditional cooperation and punishment from a strategy method experiment
通过新实验设计，研究了他人贡献变化如何影响条件合作与惩罚行为，发现贡献不平等时人们更自私，惩罚则受目标玩家和第三方贡献的双重影响。
Abstract This paper introduces new experimental designs to examine how conditional cooperation and punishment behaviours respond to the full range of variation in the contributions of others. It is shown that contributions become significantly more selfish-biased as others contribute more unequally, while punishment increases both with decreasing contributions by the target player and increasing contributions by a third player. Low contributors who punish antisocially do not direct their punishment specifically toward high contributors, while their beliefs indicate that they expect to themselves be punished.