On the Number and Size of Nations
研究不同政治体制和经济一体化程度下国家数量的均衡决定，发现民主化导致分裂，均衡时国家数量通常过多且随经济一体化增加。
This paper studies the equilibrium determination of the number of countries in different political regimes, and in different economic environments, with more or less economic integration. We focus on the trade-off between the benefits of large jurisdictions and the costs of heterogeneity of large and diverse populations. Our model implies that (i) democratization leads to secessions; (ii) in equilibrium one generally observes an inefficiently large number of countries; (iii) the equilibrium number of countries is increasing in the amount of economic integration.