Average city size and economic growth
研究了1960-2010年114个国家平均城市规模与经济增长的关系，发现高收入国家存在正向但递减的关联，而发展中国家则无显著或负向关系。
This paper examines the link between average city size and aggregate economic growth in a total of 114 countries for the period between 1960 and 2010. The analysis -which includes pooled two-stage least-squares (2SLS), panel data analysis, system generalized method-ofmoments (GMM) estimator, and an instrumental variable (IV) approach -finds that, in contrast to the prevailing view, there is no universal positive relationship between average city size and economic growth and that the results vary between high-income and developing countries. In high-income countries, there is consistent evidence of a positive albeit decreasing link between city size and economic growth. In contrast, the relationship does not hold for developing countries, for which most of the coefficients display insignificant results or point towards a negative connection between both factors.