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

  • Rachel Griffith
  • Sokbae Lee
  • John Van Reenen

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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File URL: http://www.nber.org/papers/w13338.pdf
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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 13338.

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Date of creation: Aug 2007
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Publication status: published as Rachel Griffith & Sokbae Lee & John Van Reenen, 2011. "Is distance dying at last? Falling home bias in fixed‐effects models of patent citations," Quantitative Economics, Econometric Society, vol. 2(2), pages 211-249, 07.
Handle: RePEc:nbr:nberwo:13338
Note: LS PR
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  10. Sokbae 'Simon' 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.
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  12. Adam Jaffe & Manuel Trajtenberg, 1999. "International Knowledge Flows: Evidence From Patent Citations," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 8(1-2), pages 105-136.
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  14. Head, Keith & Mayer, Thierry & Ries, John, 2009. "How remote is the offshoring threat?," European Economic Review, Elsevier, vol. 53(4), pages 429-444, May.
  15. Zvi Griliches, 1991. "The Search for R&D Spillovers," NBER Working Papers 3768, National Bureau of Economic Research, Inc.
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  20. 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.
  21. 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.
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