Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations

Adam Jaffe, Manuel Trajtenberg and Rebecca Henderson

No 3993, NBER Working Papers from National Bureau of Economic Research, Inc

Abstract: 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.

Date: 1992-02
Note: PR
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Published as The Quarterly Journal of Economics, vol cviii. August 1993, issue 3 (MIT Press, Cambridge), p. 577

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Related works:
Journal Article: Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations (1993)
Working Paper: Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations (1992)
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