Innovation across cities
研究了OECD 218个城市2000-2008年专利活动的分布，发现专利比人口和GDP更集中但更不持久，且与GDP和人口密度正相关，对政策制定者有参考价值。
Abstract This paper examines the distribution of patenting activity across cities in the OECD, using a sample of 218 cities from 2000 to 2008. We obtain three main results. First, patenting activity is more concentrated than population and GDP. Second, patenting activity is less persistent than population and GDP, especially in the middle of the distribution. Third, in a parametric model, patenting does not exhibit mean‐reversion, and is positively associated with GDP and population density. Our results suggest that policymakers can influence the amount of innovative activity through the use of appropriate policies.