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Market Value and Patent Citations: A First Look

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  • Bronwyn H. Hall and Adam Jaffe, and Manuel Trajtenberg.

Abstract

Bronwyn H. Hall, Adam Jaffe and Manuel Trajtenberg. JEL #: O31, O38 Keywords: market value, patent citations, bibliometrics, innovation As patent data become more available in machine-readable form, an increasing number of researchers have begun to use measures based on patents and their citations as indicators of technological output and information flow. This paper explores the economic meaning of these citation-based patent measures using the financial market valuation of the firms that own the patents. Using a new and comprehensive dataset containing over 4800 U. S. Manufacturing firms and their patenting activity for the past 30 years, we explore the contributions of R&D spending, patents, and citation-weighted patents to measures of Tobin's Q for the firms. We find that citation-weighted patent stocks are more highly correlated with market value than patent stocks themselves and that this fact is due mainly to the high valuation placed on firms that hold very highly cited patents. May 2000

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Bibliographic Info

Paper provided by University of California at Berkeley in its series Economics Working Papers with number E01-304.

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Date of creation: 01 Aug 2001
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Handle: RePEc:ucb:calbwp:e01-304

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References

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  1. Ariel Pakes & Mark Schankerman, 1984. "The Rate of Obsolescence of Patents, Research Gestation Lags, and the Private Rate of Return to Research Resources," NBER Chapters, in: R & D, Patents, and Productivity, pages 73-88 National Bureau of Economic Research, Inc.
  2. Georg LICHT & Konrad ZOZ, 1998. "Patents and R&D, An Econometric Investigation Using Applications for German, European and US Patents by German Companies," Annales d'Economie et de Statistique, ENSAE, issue 49-50, pages 329-360.
  3. Ariel Pakes & Mark Schankerman, 1979. "The Rate of Obsolescence Of Knowledge, Research Gestation Lags, and the Private Rate of Return to Research Resources," NBER Working Papers 0346, National Bureau of Economic Research, Inc.
  4. Zvi Griliches & Bronwyn H. Hall & Ariel Pakes, 1988. "R&D, Patents, and Market Value Revisited: Is There Evidence of A SecondTechnological Opportunity Related Factor?," NBER Working Papers 2624, National Bureau of Economic Research, Inc.
  5. Wildasin, David E, 1984. "The q Theory of Investment with Many Capital Goods," American Economic Review, American Economic Association, vol. 74(1), pages 203-10, March.
  6. Chaney, Paul K & Devinney, Timothy M & Winer, Russell S, 1991. "The Impact of New Product Introductions on the Market Value of Firms," The Journal of Business, University of Chicago Press, vol. 64(4), pages 573-610, October.
  7. Connolly, Robert A & Hirsch, Barry T & Hirschey, Mark, 1986. "Union Rent Seeking, Intangible Capital, and Market Value of the Firm," The Review of Economics and Statistics, MIT Press, vol. 68(4), pages 567-77, November.
  8. Samuel Kortum & Josh Lerner, 1997. "Stronger Protection or Technological Revolution: What is Behind the Recent Surge in Patenting?," NBER Working Papers 6204, National Bureau of Economic Research, Inc.
  9. Manuel Trajtenberg & Rebecca Henderson & Adam Jaffe, 1997. "University Versus Corporate Patents: A Window On The Basicness Of Invention," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 5(1), pages 19-50.
  10. Mark Schankerman, 1998. "How Valuable is Patent Protection? Estimates by Technology Field," RAND Journal of Economics, The RAND Corporation, vol. 29(1), pages 77-107, Spring.
  11. Connolly, Robert A. & Hirschey, Mark, 1988. "Market value and patents : A Bayesian approach," Economics Letters, Elsevier, vol. 27(1), pages 83-87.
  12. Richard C. Levin & Alvin K. Klevorick & Richard R. Nelson & Sidney G. Winter, 1987. "Appropriating the Returns from Industrial Research and Development," Brookings Papers on Economic Activity, Economic Studies Program, The Brookings Institution, vol. 18(3), pages 783-832.
  13. Ariel Pakes, 1986. "Patents as Options: Some Estimates of the Value of Holding European Patent Stocks," NBER Working Papers 1340, National Bureau of Economic Research, Inc.
  14. Cockburn, Iain & Griliches, Zvi, 1988. "Industry Effects and Appropriability Measures in the Stock Market's Valuation of R&D and Patents," American Economic Review, American Economic Association, vol. 78(2), pages 419-23, May.
  15. Dietmar Harhoff & Francis Narin & F. M. Scherer & Katrin Vopel, 1999. "Citation Frequency And The Value Of Patented Inventions," The Review of Economics and Statistics, MIT Press, vol. 81(3), pages 511-515, August.
  16. Fumio Hayashi & Tohru Inoue, 1990. "The Relation Between Firm Growth and Q with Multiple Capital Goods: Theory and Evidence from Panel Data on Japanese Firms," NBER Working Papers 3326, National Bureau of Economic Research, Inc.
  17. Zvi Griliches & Ariel Pakes & Bronwyn H. Hall, 1988. "The Value of Patents as Indicators of Inventive Activity," NBER Working Papers 2083, National Bureau of Economic Research, Inc.
  18. Bronwyn H. Hall, 1990. "The Manufacturing Sector Master File: 1959-1987," NBER Working Papers 3366, National Bureau of Economic Research, Inc.
  19. Albert, M. B. & Avery, D. & Narin, F. & McAllister, P., 1991. "Direct validation of citation counts as indicators of industrially important patents," Research Policy, Elsevier, vol. 20(3), pages 251-259, June.
  20. Megna, Pamela & Klock, Mark, 1993. "The Impact on Intangible Capital on Tobin's q in the Semiconductor Industry," American Economic Review, American Economic Association, vol. 83(2), pages 265-69, May.
  21. Blundell, Richard & Griffith, Rachel & van Reenen, John, 1999. "Market Share, Market Value and Innovation in a Panel of British Manufacturing Firms," Review of Economic Studies, Wiley Blackwell, vol. 66(3), pages 529-54, July.
  22. Richard C. Levin & Alvin K. Klevorick & Richard R. Nelson & Sidney G. Winter, 1988. "Appropriating the Returns from Industrial R&D," Cowles Foundation Discussion Papers 862, Cowles Foundation for Research in Economics, Yale University.
  23. Austin, David H, 1993. "An Event-Study Approach to Measuring Innovative Output: The Case of Biotechnology," American Economic Review, American Economic Association, vol. 83(2), pages 253-58, May.
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