It's a Small(er) World: The Role of Geography in Biotechnology Innovation
Daniel K. N. Johnson
Colorado College - Department of Economics and Business
Colorado College Working Paper No. 2006-03
Using patent citation data for the U.S., we test whether knowledge spillovers in biotechnology are sensitive to distance, and whether that sensitivity has changed over time. Controlling for self-citation by inventor, assignee and examiner, cohort-based regression analysis shows that physical distance is becoming less important for spillovers with time.
Number of Pages in PDF File: 23
Keywords: biotechnology, innovation, patent, citation, distance, geography
JEL Classification: L6, N9, O3, R1
Date posted: January 15, 2002
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