To share the fixed cost of a communication network, the private cost method allocates to each subscriber the cost of his dedicated terminal devices. The external cost method shares the connecting cost of user i between all of his correspondents in proportion of their traffic with i. All convex...

A tragedy of the commons appears when the users of a common resource have incentives to exploit it more than the socially efficient level. We analyze the situation when the tragedy of the commons is embedded in a network of users and sources. Users play a game of extractions, where they decide...

We study a strategic model of community formation on networks. Starting from a seed community member, the process of community formation is sequential, with infinitely-patient and forward-looking agents making strategic offers to their neighbors. Each agent makes an irreversible binary choice,...