Ethnic and kinship ties have long been viewed as potential catalysts for favoritism, and hence corruption. In experiments conducted in three countries, we recruit siblings, co-ethnics and strangers and vary the relationship(s) between the players of a game to observe how kin and ethnic ties...

Classroom peers are believed to influence learning by teaching each other, and the efficacy of this teaching likely depends on classroom composition in terms of peers' ability. Unfortunately, little is known about peer-to-peer teaching because it is never observed in field studies. Furthermore,...

Classroom peers are believed to influence learning by teaching each other, and the efficacy of this teaching likely depends on classroom composition in terms of peers' ability. Unfortunately, little is known about peer-to-peer teaching because it is never observed in field studies. Furthermore,...

When individuals trade with strangers, there is a temptation to renege on agreements. If repeated interaction or exogenous enforcement are unavailable, societies often solve this problem via institutions that rely on group, rather than individual, reputation. Groups can employ two mechanisms to...

Classroom peers presumably influence learning by teaching each other. Unfortunately, little is known about peer-to-peer teaching because it is never observed in field studies. The efficacy of this teaching likely depends on the ability of one's peers. We investigate the mechanisms of peer...