We investigate the intrinsic motivation of individuals to report, and thereby sanction, fellow group members who lie for personal gain. We further explore the changes in lying and reporting behavior that result from giving individuals a say in who joins their group. We find that enough...

Firms exhibit heterogeneity in size, productivity, and internal structure, and this is true even within the same industry. It has been thought since the time of Adam Smith that a firm's internal structure affects its productivity through the channel of gains from specialization. Our paper...

The relationship between third-party contract enforcement and informal networks raises important sociological, political, and economic questions. When economic activity is embedded in social structures, what are the implications of third-party contract enforcement for the scope and nature of...