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...

Suppose that individual payoffs depend on the network connecting them. Consider the following simultaneous move game of network formation: players announce independently the links they wish to form, and links are formed only under mutual consent. We provide necessary and sufficient conditions on...

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...