This article studies a model of coalition formation for the joint production (and finance) of public projects, in which agents may belong to multiple coalitions. We show that, if projects are divisible, there always exists a stable (secession-proof) structure, i.e., a structure in which no...

Polarization measures, that are used in examining the empirical relationship between ethnic divisions and violent conflict, heavily rely on mechanisms of group identification and often use somewhat arbitrary divisions of a society into ethnic groups. In this paper we construct two new measures...