We present a theory of spatial development. Manufacturing and services firms located in a continuous geographic area choose each period how much to innovate. Firms trade subject to transport costs and technology diffuses spatially. We apply the model to study the evolution of the US economy in...

This paper documents the pervasiveness of job polarization in 16 Western European countries over the period 1993-2010. It then develops and estimates a framework to explain job polarization using routine-biased technological change and offshoring. This model can explain much of both total job...

This paper analyzes long-term effects of skilled-worker immigration on productivity for the Huguenot migration to Prussia. In 1685, religiously persecuted French Huguenots settled in Brandenburg- Prussia and compensated for population losses due to plagues during the Thirty Years' War. We...

An increasingly influential "technological-discontinuity" paradigm suggests that IT-induced technological changes are rapidly raising productivity while making workers redundant. This paper explores the evidence for this view among the IT-using US manufacturing industries. There is some limited...

Modern growth theory suggests that more than three-quarters of growth since 1950 reflects rising educational attainment and research intensity. As these transition dynamics fade, US economic growth is likely to slow at some point. However, the rise of China, India, and other emerging economies...

In skill-biased (deskilling) technological revolutions, learning investments required by new machines are greater (smaller) than those required by preexisting machines. Skill-biased (deskilling) revolutions trigger reallocations of capital from slow- (fast-) to fast- (slow-) learning workers,...

This paper empirically assesses the incidence and efficiency of Round I of the federal urban Empowerment Zone (EZ ) program using confidential microdata from the Decennial Census and the Longitudinal Business Database. Using rejected and future applicants to the EZ program as controls, we find...