The Dynamics of Smithian Growth
分析市场地理扩张通过专业化推动经济增长的演化过程，证明存在临界运输密度：低于此密度经济分裂为孤立市场，高于此密度市场融合加速增长，并用宋朝水路网络与商业化革命验证该理论。
This paper analyzes the evolution of an economy where growth is driven by increased specialization caused by the geographical expansion of markets. It proves that such Smithian growth exhibits generic threshold behavior. Below a critical density of transport linkages, the economy is split into isolated local markets with limited specialization. Above the critical density, these markets begin to fuse into a large, economywide market causing growth to accelerate. This allows an explicit test of the consensus among historians of Sung dynasty China that the economic revolution during that period was a result of commercialization caused by the creation of a national waterway network.