Beyond zeroes and ones: the severity and evolution of civil conflict

We assess risk factors affecting the severity and dynamics of civil wars, departing from analyses focused primarily on static models of the effect of income on the extensive margin of conflict. Civil conflicts are shown to be persistent, but rarely do they become more severe in response to past fighting. Substantial heterogeneity in the speed of mean reversion is documented: severe fighting lasts longest in poor countries and ethnically fractionalized countries.