NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Breakthrough Inventions and Migrating Clusters of Innovation

William R. Kerr

NBER Working Paper No. 15443
Issued in October 2009

---- Acknowledgements -----

Comments are appreciated and can be sent to wkerr@hbs.edu. I am grateful to Ajay Agrawal, Megan MacGarvie, Ed Glaeser, Stuart Rosenthal, Will Strange, and seminar participants at Kauffman Foundation Cities and Entrepreneurship Conference, NBER Productivity, and UBC Sauder for feedback on this work. This research is supported by Harvard Business School, the National Science Foundation, the Innovation Policy and the Economy Group, and the MIT George Schultz Fund. A previous version of this paper was titled "Immigrants and Spatial Adjustments in US Invention." The views expressed herein are those of the author(s) and do not necessarily reflect the views of the National Bureau of Economic Research.

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