Long-run analysis of regional inequalities in the US
分析了美国各地区经济发展差异的长期趋势，发现资源禀赋、人口、移民及政府政策共同驱动了区域收敛与发散，且全国一体化经济的推进速度受历史和政策影响。
Abstract We consider the regional differences in economic development across the United States, which have been a unique feature of American economic history. The paths of both convergence and divergence by region have been driven by a complex mix of differences in resource endowments, demographic differences, international and internal migration patterns, and variation in the scope and impact of government policies at the local, state, and federal level. We show that the development of a national and fully integrated economy have accelerated and decelerated over time, and these features are driven by unique sets of historical circumstances and policy choices.