We study the formation of coalitions that provide public goods to members. Individuals are linked on a tree graph and those with similar preferences are connected on the tree. We present a well-defined solution that selects envy-free allocations from the core

Many public goods that are provided by coalitions have a group-size effect. Namely, people prefer to consume a public good in a larger coalition. This paper studies local public goods games with anonymous and separable group-size effect. The core is nonempty when coalition feasible sets are...

Many local public goods are provided in coalitions. When coalitions form they may have the power to exclude members. The core applies to such cases. When coalitions cannot exclude members, all who prefer the provided public good can join. The no-exodus equilibrium is proposed for such cases. It...