Peer Group Effects, Sorting, and Fiscal Federalism

Suppose that, other things equal, an individual's utility increases with the fraction of residents in his community who are rich. Suppose further that the rich are more willing to pay for a local public than are the poor Then the rich may over-provide a local public good, with the aim of dissuading the poor from moving into a community inhabited by the rich. We describe conditions under which the equilibrium will have mixed or homogeneous communities, and conditions under which the rich or the poor benefit from central government rules which constrain local decision making.