Growth, distance to frontier and composition of human capital
通过创新和模仿两个渠道，研究人力资本对技术进步的贡献，发现技能劳动力在接近技术前沿时增长效应更强，并用1960-2000年19个OECD国家面板数据验证，指出高等教育是经济分化的因素。
We examine the contribution of human capital to economy-wide technological improvements through the two channels of innovation and imitation. We develop a theoretical model showing that skilled labor has a higher growth-enhancing effect closer to the technological frontier under the reasonable assumption that innovation is a relatively more skillintensive activity than imitation. Also, we provide evidence in favor of this prediction using a panel dataset covering 19 OECD countries between 1960 and 2000 and explain why previous empirical research had found no positive relationship between initial schooling level and subsequent growth in rich countries. In particular, we show that in OECD economies it is crucial to isolate the two separate margins of primary/secondary and tertiary education. Interestingly, the latter type of schooling proves to be a factor of economic divergence.