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Planes, Trains and Automobiles: The Importance of Location for Knowledge Transfer in the Transportation SectorJeff MooreColorado College - Department of Economics and Business Daniel K. N. JohnsonColorado College - Department of Economics and Business Kristina M. LybeckerColorado College - Department of Economics & Business June 10, 2012 Colorado College Working Paper No. 2012-10 Abstract: Using over 200,000 U.S. patent citations, we test whether knowledge transfers in the transportation sector are sensitive to distance, and whether that sensitivity has changed over time. Controlling for self-citation by inventor, assignee and examiner, multivariate regression analysis shows that physical distance is becoming less important for spillovers with time, albeit in a nonlinear fashion.
Number of Pages in PDF File: 13 Keywords: Transportation Sector, Patents, Knowledge Clustering, Left-censored Tobit JEL Classification: L62, R3, L2, Q55 working papers seriesDate posted: June 10, 2012Suggested CitationContact Information
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