期刊
JOURNAL OF EVOLUTIONARY ECONOMICS
卷 19, 期 3, 页码 397-415出版社
SPRINGER
DOI: 10.1007/s00191-008-0131-7
关键词
Cooperation; Imitation; Local interaction; Conformism
类别
We analyze a local interaction model where agents play a bilateral prisoner's dilemma game with their neighbors. Agents learn about behavior through payoff-biased imitation of their interaction neighbors (and possibly some agents beyond this set). We find that the Eshel et al. (Am Econ Rev 88:157-179, 1998) result that polymorphic states are stochastically stable in such a setting is not robust. In particular, whenever agents use information also of some agents beyond their interaction neighbors, the unique stable outcome is one where everyone chooses defection. Introducing a sufficiently strong conformist bias into the imitation process, we find that full cooperation always emerges. Conformism is thus identified as a new mechanism that can stabilize cooperation.
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