Two phenomena have been recently utilized to explain conflict onset: greed and grievance. The former reflects elite competition over valuable natural resource rents. The latter argues that grievance fuels conflict. Central to grievance are concepts of interethnic or horizontal inequality....

Contemporary civil wars are rooted in a partial or complete breakdown of the social contract, often involving disputes over public spending, resource revenues, and taxation. A feasible social contract gives potential rebels something akin to a transfer. When this is improbable, and the potential...