Agents connected in a network face a binary choice whether to "contribute" or to "free-ride". The former action is costly but benefits the agent and her neighbors, while the latter is free but does not provide any benefits. Who will contribute if agents react to actions of their neighbors and...

We develop a model where workers both choose their residential location (geographical space) and their social interactions (social space). In equilibrium, we show under which condition some individuals reside close to the job center while others live far away from it. Even though the two...