Cooperation among Strangers under the Shadow of the Future
通过实验研究陌生人在无限期互动中如何自发形成合作规范，发现即使匿名也能维持合作，监控和惩罚制度能显著促进合作，且被试多采用选择性惩罚策略。
We study the emergence of norms of cooperation in experimental economies populated by strangers interacting indefinitely. Can these economies achieve full efficiency even without formal enforcement institutions? Which institutions for monitoring and enforcement facilitate cooperation? Finally, what classes of strategies do subjects employ? We find that, first, cooperation can be sustained even in anonymous settings; second, some type of monitoring and punishment institutions significantly promote cooperation; and, third, subjects mostly employ strategies that are selective in punishment.