Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations
AbstractThe authors compare the geographic location of patent citations with that of the cited patents as evidence of the extent to which knowledge spillovers are geographically localized. They find that citations to domestic patents are more likely to be domestic and more likely to come from the same state and SMSA as the cited patents, compared with a 'control frequency' reflecting the preexisting concentration of related research activity. These effects are particularly significant at the local (SMSA) level. Localization fades over time but only very slowly. There is no evidence that more 'basic' inventions diffuse more rapidly than others. Copyright 1993, the President and Fellows of Harvard College and the Massachusetts Institute of Technology.
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Bibliographic InfoPaper provided by Tel Aviv in its series Papers with number 14-92.
Length: 42 pages
Date of creation: 1992
Date of revision:
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Postal: Israel TEL-AVIV UNIVERSITY, THE FOERDER INSTITUTE FOR ECONOMIC RESEARCH, RAMAT AVIV 69 978 TEL AVIV ISRAEL.
Web page: http://econ.tau.ac.il/research/foerder.asp
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Other versions of this item:
- Jaffe, Adam B & Trajtenberg, Manuel & Henderson, Rebecca, 1993. "Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations," The Quarterly Journal of Economics, MIT Press, vol. 108(3), pages 577-98, August.
- Adam B. Jaffe & Manuel Trajtenberg & Rebecca Henderson, 1992. "Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations," NBER Working Papers 3993, National Bureau of Economic Research, Inc.
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