41 Pages Posted: 11 Sep 2009
Date Written: September 10, 2009
We investigate the speed at which clusters of invention for a technology migrate spatially following breakthrough inventions. We identify breakthrough inventions as the top one percent of US inventions for a technology during 1975-1984 in terms of subsequent citations. Patenting growth is significantly higher in cities and technologies where breakthrough inventions occur after 1984 relative to peer locations that do not experience breakthrough inventions. This growth differential in turn depends on the mobility of the technology’s labor force, which we model through the extent that technologies depend upon immigrant scientists and engineers. Spatial adjustments are faster for technologies that depend heavily on immigrant inventors. The results qualitatively con.rm the mechanism of industry migration proposed in models like [Duranton, G., 2007. Urban evolutions: The fast, the slow, and the still. American Economic Review 97, 197.221].
Keywords: Agglomeration, Clusters, Entrepreneurship, Invention, Mobility, Reallocation, R&D, Patents, Scientists, Engineers, Immigration.
JEL Classification: F2, J4, J6, O3, O4, R1, R3.
Suggested Citation: Suggested Citation
Kerr, William R., Breakthrough Inventions and Migrating Clusters of Innovation (September 10, 2009). Harvard Business School Entrepreneurial Management Working Paper No. 10-020. Available at SSRN: https://ssrn.com/abstract=1471435 or http://dx.doi.org/10.2139/ssrn.1471435