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Breakthrough Inventions and Migrating Clusters of Innovation

In: Cities and Entrepreneurship

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  • William R. Kerr

Abstract

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].

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This chapter was published in:

  • Edward L. Glaeser & Stuart S. Rosenthal & William C. Strange, 2010. "Cities and Entrepreneurship," NBER Books, National Bureau of Economic Research, Inc, number glae09-1.
    This item is provided by National Bureau of Economic Research, Inc in its series NBER Chapters with number 11891.

    Handle: RePEc:nbr:nberch:11891

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