Social preferences under the shadow of the future
通过预注册实验，检验了在无限重复囚徒困境中社会偏好的因果作用，发现亲社会个体在隔离群体中能维持高水平合作，并比较了混合与自私群体的行为条件。
Abstract Social interactions frequently take place under the shadow of the future. Previous literature explains cooperation in indefinitely repeated prisoner’s dilemma as driven predominantly by self-interested strategic considerations. This paper provides a causal test of the importance of social preferences in such contexts. In a series of pre-registered experiments, we show that high levels of cooperation can be sustained when prosocial individuals interact in segregated groups. By comparing their behavior with that of mixed and selfish groups, we highlight the conditions under which other-regarding motivations matter in repeated interactions.