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Planes, Trains and Automobiles: The Importance of Location for Knowledge Transfer in the Transportation Sector

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Document pages: 13 pages

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.

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