This paper develops a model that allows for heterogenous contemporaneous peer effects among different types of agents who are endogenously selected into different peer groups. Using our framework, we characterize the reduced-form coefficient in the peer effect literature and show that it is a...

In the recent literature, increasing attention has been paid to cases when the shocks to a small number of firms would lead to large volatility in many sectors. Theorists find that supply chains play a role, as the shocks to a firm or a sector may propagate through the input–output linkages...