There is a large literature on social interactions and still little is known about the economic mechanisms leading to the high level of clustering in behavior that is so commonly observed in the data. In this paper we present a model in which agents are allowed to interact according to three...

Economists have a poor understanding of the mechanisms underlying reduced-form college peer effects. In this paper we explore a candidate mechanism, the provision of school effort. We show that, when earnings reflect individual educational performance as well as the field of study selected at...