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Patent Citations and the Geography of Knowledge Spillovers: A Reassessment

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Author Info

  • Peter Thompson
  • Melanie Fox-Kean

Abstract

Jaffe, Trajtenberg and Henderson (Quarterly Journal of Economics, 108(3):577-98, 1993) developed a matching method to study the geography of knowledge spillovers using patent citations, and found that knowledge spillovers are strongly localized. Their method matches each citing patent to a non-citing patent intended to control for the pre-existing geographic concentration of production. We show how the method of selecting the control group may induce spurious evidence of localized spillovers. This paper reassesses their findings using control patents selected under different criteria. Doing so eliminates evidence of strong intranational localization effects at the state and metropolitan levels, but leaves largely unaffected evidence of international localization effects.

(This abstract was borrowed from another version of this item.)

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File URL: http://www.aeaweb.org/articles.php?doi=10.1257/0002828053828509
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File URL: http://www.aeaweb.org/aer/data/mar05_data_thompson.zip
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Bibliographic Info

Article provided by American Economic Association in its journal American Economic Review.

Volume (Year): 95 (2005)
Issue (Month): 1 (March)
Pages: 450-460

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Handle: RePEc:aea:aecrev:v:95:y:2005:i:1:p:450-460

Note: DOI: 10.1257/0002828053828509
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  1. Jaffe, A.B. & Trajtenberg, M., 1998. "International Knowledge Flows: Evidence from Patent Citation," Papers 11-98, Tel Aviv.
  2. Bronwyn H. Hall, Adam Jaffe and Manuel Trajtenberg., 2000. "Market Value and Patent Citations: A First Look," Economics Working Papers E00-277, University of California at Berkeley.
  3. Peter Thompson & Melanie Fox Kean, 2004. "Patent Citations and the Geography of Knowledge Spillovers: A Reassessment," Working Papers 0401, Florida International University, Department of Economics.
  4. Hall, B. & Jaffe, A. & Trajtenberg, M., 2001. "The NBER Patent Citations Data File: Lessons, Insights and Methodological Tools," Papers 2001-29, Tel Aviv.
  5. Paul Almeida & Bruce Kogut, 1999. "Localization of Knowledge and the Mobility of Engineers in Regional Networks," Management Science, INFORMS, vol. 45(7), pages 905-917, July.
  6. Edward L. Glaeser, 1997. "Learning in Cities," Harvard Institute of Economic Research Working Papers 1814, Harvard - Institute of Economic Research.
  7. Manuel Trajtenberg, 1990. "A Penny for Your Quotes: Patent Citations and the Value of Innovations," RAND Journal of Economics, The RAND Corporation, vol. 21(1), pages 172-187, Spring.
  8. Jaffe, A.B. & Trajtenberg, M., 1992. "Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations," Papers 14-92, Tel Aviv.
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