摘要：We present a theory of ethnic conflict in which coalitions formed along ethnic
lines compete for the economy’s resources. The role of ethnicity is to enforce
coalition membership: in ethnically homogeneous societies members of the losing
coalition can defect to the winners at low cost, and this rules out conflict as
an equilibrium outcome. We derive a number of implications of the model relating
social, political, and economic indicators such as the incidence of conflict,
the distance among ethnic groups, group sizes, income inequality, and
expropriable resources
