Spatial Agglomeration Dynamics
构建了一个经济活动和增长在三维无特征全球地理上内生定位的模型，揭示增长、收敛与空间集聚的相互作用，指出空间不平等是达到平等增长的必经之路。
This Paper develops a model of economic growth and activity locating endogenously on a 3-dimensional featureless global geography. The same economic forces influence simultaneously growth, convergence, and spatial agglomeration and clustering. Economic activity is not concentrated on discrete isolated points but instead a dynamically-fluctuating, smooth spatial distribution. Spatial inequality is a Cass-Koopmans saddlepath, and the global distribution of economic activity converges towards egalitarian growth. Equality is stable but spatial inequality is needed to attain it.