NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations

Adam B. Jaffe, Manuel Trajtenberg, Rebecca Henderson

NBER Working Paper No. 3993
Issued in February 1992
NBER Program(s):   PR

We compare the geographic location of patent citations to those of the cited patents, as evidence of the extent to which knowledge spillovers are geographically localized. We find that citations to U.S. patents are more likely to come from the U.S., and more likely to come from the same state and SMSA as the cited patents than one would expect based only on the preexisting concentration of related research activity. These effects are particularly significant at the local (SMSA) level, and are particularly apparent in early citations.

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Document Object Identifier (DOI): 10.3386/w3993

Published: The Quarterly Journal of Economics, vol cviii. August 1993, issue 3 (MIT Press, Cambridge), p. 577 citation courtesy of

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