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Is Distance Dying at Last? Falling Home Bias in Fixed Effects Models of Patent Citations

  • Griffith, Rachel
  • Lee, Sokbae
  • Van Reenen, John

We examine the 'home bias' of international knowledge spillovers as measured by the speed of patent citations (i.e. knowledge spreads slowly over international boundaries). We present the first compelling econometric evidence that the geographical localization of knowledge spillovers has fallen over time, as we would expect from the dramatic fall in communication and travel costs. Our proposed estimator controls for correlated fixed effects and censoring in duration models and we apply it to data on over two million citations between 1975 and 1999. Home bias declines substantially when we control for fixed effects: there is practically no home bias for the more 'modern' sectors such as pharmaceuticals and information/communication technologies.

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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 6435.

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Date of creation: Sep 2007
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Handle: RePEc:cpr:ceprdp:6435
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  1. Bernstein, Jeffrey I. & Mohnen, Pierre, 1994. "International R&D Spillovers Between U.S. and Japanese R&D Intensive Sectors," Working Papers 94-20, C.V. Starr Center for Applied Economics, New York University.
  2. Hall, Bronwyn H & Jaffe, Adam B & Trajtenberg, Manuel, 2001. "The NBER Patent Citations Data File: Lessons, Insights and Methodological Tools," CEPR Discussion Papers 3094, C.E.P.R. Discussion Papers.
  3. Keller, W., 1996. "Are International R&D Spillovers Trade-Related? Analyzing Spillovers Among Randomly Matched Trade Partners," Working papers 9607, Wisconsin Madison - Social Systems.
  4. Keith Head & Thierry Mayer & John Ries, 2008. "How Remote is the Offshoring Threat ?," Sciences Po publications info:hdl:2441/10143, Sciences Po.
  5. Zvi Griliches, 1998. "The Search for R&D Spillovers," NBER Chapters, in: R&D and Productivity: The Econometric Evidence, pages 251-268 National Bureau of Economic Research, Inc.
  6. Carolyn L. Evans & James Harrigan, 2003. "Distance, Time, and Specialization," NBER Working Papers 9729, National Bureau of Economic Research, Inc.
  7. Pakes, Ariel S, 1986. "Patents as Options: Some Estimates of the Value of Holding European Patent Stocks," Econometrica, Econometric Society, vol. 54(4), pages 755-84, July.
  8. Nicholas Bloom & John Van Reenen, 2000. "Patents, productivity and market value: evidence from a panel of UK firms," IFS Working Papers W00/21, Institute for Fiscal Studies.
  9. E. Han Kim & Adair Morse & Luigi Zingales, 2006. "Are Elite Universities Losing Their Competitive Edge?," NBER Working Papers 12245, National Bureau of Economic Research, Inc.
  10. Coe, David T. & Helpman, Elhanan, 1995. "International R&D spillovers," European Economic Review, Elsevier, vol. 39(5), pages 859-887, May.
  11. Adam B. Jaffe & Manuel Trajtenberg, 1998. "International Knowledge Flows: Evidence from Patent Citations," NBER Working Papers 6507, National Bureau of Economic Research, Inc.
  12. Sokbae Lee, 2003. "Estimating panel data duration models with censored data," CeMMAP working papers CWP13/03, Centre for Microdata Methods and Practice, Institute for Fiscal Studies.
  13. Adair Morse, 2006. "Are elite universities losing their competitive edge?," Proceedings, Federal Reserve Bank of Cleveland.
  14. Lee G. Branstetter & Mariko Sakakibara, 2002. "When Do Research Consortia Work Well and Why? Evidence from Japanese Panel Data," American Economic Review, American Economic Association, vol. 92(1), pages 143-159, March.
  15. 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.
  16. Rachel Griffith & Rupert Harrison & John Van Reenen, 2004. "How Special is the Special Relationship? Using the Impact of US R&D Spillovers on UK Firms as a Test of Technology Sourcing," CEP Discussion Papers dp0659, Centre for Economic Performance, LSE.
  17. Rachel Griffith & Stephen Redding & John Van Reenen, 2000. "Mapping the Two Faces of R&D: Productivity Growth in a Panel of OECD Industries," CEP Discussion Papers dp0458, Centre for Economic Performance, LSE.
  18. Branstetter, Lee G., 2001. "Are knowledge spillovers international or intranational in scope?: Microeconometric evidence from the U.S. and Japan," Journal of International Economics, Elsevier, vol. 53(1), pages 53-79, February.
  19. Joel L. Horowitz & Sokbae Lee, 2002. "Semiparametric Estimation of a Panel Data Proportional Hazards Model with Fixed Effects," 10th International Conference on Panel Data, Berlin, July 5-6, 2002 A5-3, International Conferences on Panel Data.
  20. Ridder, Geert & Tunali, Insan, 1999. "Stratified partial likelihood estimation," Journal of Econometrics, Elsevier, vol. 92(2), pages 193-232, October.
  21. Wooldridge, Jeffrey M., 2007. "Inverse probability weighted estimation for general missing data problems," Journal of Econometrics, Elsevier, vol. 141(2), pages 1281-1301, December.
  22. repec:fiu:wpaper:0401 is not listed on IDEAS
  23. repec:fiu:wpaper:0405 is not listed on IDEAS
  24. Carolyn L. Evans & James Harrigan, 2005. "Distance, Time, and Specialization: Lean Retailing in General Equilibrium," American Economic Review, American Economic Association, vol. 95(1), pages 292-313, March.
  25. Bronwyn H. Hall & Adam Jaffe & Manuel Trajtenberg, 2005. "Market Value and Patent Citations," RAND Journal of Economics, The RAND Corporation, vol. 36(1), pages 16-38, Spring.
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