城市对经济增长的贡献来自于城乡劳动生产率的差异及城市劳动生产率更快的增长.城市人口规模与经济增长之间存在明显的"倒U型"关系.由净工资曲线、劳动力供给曲线决定的城市人口规模均衡点,并不一定是最优的城市人口规模.而最优的城市人口规模也不是静止不变的,它随技术条件、基础设施、政府治理的改善而变化.推动城镇化发展,建设具有包容性的城市,构建合理的城镇体系,结合过大城市分流,促进小城市发展,是实现经济持续快速增长的必要途径.%Urban contribution to economic growth comes from difference of labor productivity between urban and rural areas and faster growth of urban labor productivity. There is a clear inverted U-shaped relationship between urban population scale and economic growth. The equilibrium point of urban population scale determined by net wage curve and labor supply curve is not necessarily optimal scale of urban population. No static, optimal scale of urban population changes with the technical conditions, infrastructure, and improvement of government governance. Promoting the development of urbanization, building an inclusive city, building a reasonable urban system, and combining the oversupply of large cities to promote the development of small cities are necessary ways to achieve sustainable and rapid economic growth.
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