This paper investigates how punishment promotes cooperation when the punishment enforcer is independent of its proposer. In a prisoner's dilemma experiment, compared with the case when the implicated parties are allowed to punish each other, cooperation is lower when the enforcement of...

Despite the efficacy of Pigouvian taxes, governments often find them surprisingly controversial to implement. Evidence suggests the reason may be their complexity, which stems from the delay of externality. This paper studies whether communication among peers can promote public support for...

People often struggle to achieve self-improvement goals. In a randomized controlled trial, we nudged participants with peer information to sign up for a goal-setting activity. We find that while nudging leads to a higher sign-up rate relative to the baseline without nudging, it does not always...

We conducted a field experiment in a typical Chinese prison to examine the in-group bias of groups with a stigmatized identity. Inmates were given the opportunity to work for a charity. We found evidence of both pro-sociality and in-group favoritism among inmates. In particular, inmates...