This article examines optimal social linkage when each individual's repeated interaction with each of his neighbors creates spillovers. Each individual's discount factor is randomly determined. A planner chooses a local interaction network or "neighborhood design" before the discount factors are...

I characterize the asymptotic behavior of a society facing a repeated-common-interest game. In this society, new individuals enter to replace their "parents" at random times. Each entrant has possibly different beliefs about others' behavior than his or her predecessor. A self-confirming...