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Persistent heterogeneity of R&D intensities within sectors: Evidence and policy implications

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  • Alex Coad

    (CENTRUM-Catolica Graduate Business School, Pontificia Universidad Catolica del Peru, Lima, Peru.)

Abstract

Do firms in the same sector converge towards the same R&D intensities? Previous research has often assumed this to be true. A closer examination, using microdata from the EU Industrial R&D Investment Scoreboard for the years 2000-2015, shows a large amount of heterogeneity in R&D intensities among firms in the same sector, and that this heterogeneity persists over time. Statistical tests of convergence show that the variation in R&D intensities does not decrease over time (i.e. no ?-convergence), although firms with an R&D intensity below the industry average do seem to catch up with the leaders (i.e. evidence of ?-convergence). Overall, firms in the same industry do not converge to a common R&D intensity. Policy implications are discussed.

Suggested Citation

  • Alex Coad, 2017. "Persistent heterogeneity of R&D intensities within sectors: Evidence and policy implications," JRC Working Papers on Corporate R&D and Innovation 2017-04, Joint Research Centre.
    • Handle: RePEc:ipt:wpaper:201704
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    1. Hartmann, Marcus & Hassan, Ali, 2006. "Application of real options analysis for pharmaceutical R&D project valuation--Empirical results from a survey," Research Policy, Elsevier, vol. 35(3), pages 343-354, April.
    2. Michele Cincera & Reinhilde Veugelers, 2011. "Europe's missing Yollies," Reflets et perspectives de la vie économique, De Boeck Université, vol. 0(3), pages 93-105.
    3. Dirk Czarnitzki & Andrew A. Toole, 2011. "Patent Protection, Market Uncertainty, and R&D Investment," The Review of Economics and Statistics, MIT Press, vol. 93(1), pages 147-159, February.
    4. Alex Coad & Nicola Grassano, 2019. "Firm growth and R&D investment: SVAR evidence from the world’s top R&D investors," Industry and Innovation, Taylor & Francis Journals, vol. 26(5), pages 508-533, May.
    5. 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.
    6. Giovanni Dosi & Luigi Marengo, 2007. "On the Convergence of Evolutionary and Behavioral Theories of Organizations: A Tentative Roadmap," LEM Papers Series 2007/01, Laboratory of Economics and Management (LEM), Sant'Anna School of Advanced Studies, Pisa, Italy.
    7. Nicholas Bloom & Mark Schankerman & John Van Reenen, 2013. "Identifying Technology Spillovers and Product Market Rivalry," Econometrica, Econometric Society, vol. 81(4), pages 1347-1393, July.
    8. Cohen, Wesley M & Klepper, Steven, 1996. "A Reprise of Size and R&D," Economic Journal, Royal Economic Society, vol. 106(437), pages 925-951, July.
    9. David Roodman, 2009. "How to do xtabond2: An introduction to difference and system GMM in Stata," Stata Journal, StataCorp LP, vol. 9(1), pages 86-136, March.
    10. John Bound & Clint Cummins & Zvi Griliches & Bronwyn H. Hall & Adam B. Jaffe, 1984. "Who Does R&D and Who Patents?," NBER Chapters, in: R&D, Patents, and Productivity, pages 21-54, National Bureau of Economic Research, Inc.
    11. Lichtenberg, Frank R, 1994. "Testing the Convergence Hypothesis," The Review of Economics and Statistics, MIT Press, vol. 76(3), pages 576-579, August.
    12. Michele Cincera & Reinhilde Veugelers, 2013. "Young leading innovators and the EU's R&D intensity gap," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 22(2), pages 177-198, March.
    13. Leiponen, Aija & Drejer, Ina, 2007. "What exactly are technological regimes?: Intra-industry heterogeneity in the organization of innovation activities," Research Policy, Elsevier, vol. 36(8), pages 1221-1238, October.
    14. Philippe Aghion & Nick Bloom & Richard Blundell & Rachel Griffith & Peter Howitt, 2005. "Competition and Innovation: an Inverted-U Relationship," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 120(2), pages 701-728.
    15. Chang-Yang Lee, 2002. "Industry R&D intensity distributions: regularities and underlying determinants," Journal of Evolutionary Economics, Springer, vol. 12(3), pages 307-341.
    16. Bruno Pottelsberghe de la Potterie, 2008. "Europe's R&D: Missing the Wrong Targets?," Intereconomics: Review of European Economic Policy, Springer;ZBW - Leibniz Information Centre for Economics;Centre for European Policy Studies (CEPS), vol. 43(4), pages 220-225, July.
    17. Azele Mathieu & Bruno van Pottelsberghe de la Potterie, 2010. "A Note on the Drivers of R&D Intensity," Research in World Economy, Research in World Economy, Sciedu Press, vol. 1(1), pages 56-65, November.
    18. Montresor, Sandro & Vezzani, Antonio, 2015. "The production function of top R&D investors: Accounting for size and sector heterogeneity with quantile estimations," Research Policy, Elsevier, vol. 44(2), pages 381-393.
    19. Franco Malerba, 2005. "Sectoral systems of innovation: a framework for linking innovation to the knowledge base, structure and dynamics of sectors," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 14(1-2), pages 63-82.
    20. Metcalfe, J S, 1994. "Competition, Fisher's Principle and Increasing Returns in the Selection Process," Journal of Evolutionary Economics, Springer, vol. 4(4), pages 327-346, November.
    21. Christopher F. Baum & Mustafa Caglayan & Oleksandr Talavera, 2016. "R&D Expenditures and Geographical Sales Diversification," Manchester School, University of Manchester, vol. 84(2), pages 197-221, March.
    22. Moncada-Paternò-Castello, Pietro & Ciupagea, Constantin & Smith, Keith & Tübke, Alexander & Tubbs, Mike, 2010. "Does Europe perform too little corporate R&D? A comparison of EU and non-EU corporate R&D performance," Research Policy, Elsevier, vol. 39(4), pages 523-536, May.
    23. Blundell, Richard & Bond, Stephen, 1998. "Initial conditions and moment restrictions in dynamic panel data models," Journal of Econometrics, Elsevier, vol. 87(1), pages 115-143, August.
    24. Pavitt, Keith, 1984. "Sectoral patterns of technical change: Towards a taxonomy and a theory," Research Policy, Elsevier, vol. 13(6), pages 343-373, December.
    25. Friedman, Milton, 1992. "Do Old Fallacies Ever Die?," Journal of Economic Literature, American Economic Association, vol. 30(4), pages 2129-2132, December.
    26. Gadi Barlevy, 2007. "On the Cyclicality of Research and Development," American Economic Review, American Economic Association, vol. 97(4), pages 1131-1164, September.
    27. Hall, Bronwyn H. & Hayashi, Fumio, 1989. "Research and Development as an Investment," Department of Economics, Working Paper Series qt8br8d266, Department of Economics, Institute for Business and Economic Research, UC Berkeley.
    28. Michele Cincera & Julien Ravet, 2010. "Financing constraints and R&D investments of large corporations in Europe and the US," Science and Public Policy, Oxford University Press, vol. 37(6), pages 455-466, July.
    29. Giovanni Dosi, 2000. "Sources, Procedures, and Microeconomic Effects of Innovation," Chapters, in: Innovation, Organization and Economic Dynamics, chapter 2, pages 63-114, Edward Elgar Publishing.
    30. Andreas Reinstaller & Fabian Unterlass, 2012. "Comparing business R&D across countries over time: a decomposition exercise using data for the EU 27," Applied Economics Letters, Taylor & Francis Journals, vol. 19(12), pages 1143-1148, August.
    31. Dani Rodrik, 2013. "Unconditional Convergence in Manufacturing," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 128(1), pages 165-204.
    32. John Scott, 1984. "Firm versus Industry Variability in R&D Intensity," NBER Chapters, in: R&D, Patents, and Productivity, pages 233-248, National Bureau of Economic Research, Inc.
    33. Bronwyn Hall & Christian Helmers & Mark Rogers & Vania Sena, 2014. "The Choice between Formal and Informal Intellectual Property: A Review," Journal of Economic Literature, American Economic Association, vol. 52(2), pages 375-423, June.
    34. Giovanni Dosi & Luigi Marengo, 2007. "Perspective---On the Evolutionary and Behavioral Theories of Organizations: A Tentative Roadmap," Organization Science, INFORMS, vol. 18(3), pages 491-502, June.
    35. Nazrul Islam, 1995. "Growth Empirics: A Panel Data Approach," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 110(4), pages 1127-1170.
    36. Martin Carree & Luuk Klomp, 1997. "Testing The Convergence Hypothesis: A Comment," The Review of Economics and Statistics, MIT Press, vol. 79(4), pages 683-686, November.
    37. García-Manjón, Juan V. & Romero-Merino, M. Elena, 2012. "Research, development, and firm growth. Empirical evidence from European top R&D spending firms," Research Policy, Elsevier, vol. 41(6), pages 1084-1092.
    38. John Sutton, 2007. "Market Share Dynamics and the "Persistence of Leadership" Debate," American Economic Review, American Economic Association, vol. 97(1), pages 222-241, March.
    39. F. M. Scherer, 1967. "Research and Development Resource Allocation Under Rivalry," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 81(3), pages 359-394.
    40. Hall, Bronwyn H, 1993. "The Stock Market's Valuation of R&D Investment during the 1980's," American Economic Review, American Economic Association, vol. 83(2), pages 259-264, May.
    41. Cohen, Wesley M & Klepper, Steven, 1992. "The Anatomy of Industry R&D Intensity Distributions," American Economic Review, American Economic Association, vol. 82(4), pages 773-799, September.
    42. Hector Hernandez Guevara & Fernando Hervas Soriano & Alexander Tuebke & Antonio Vezzani & Mafini Dosso & Sara Amoroso & Nicola Grassano & Alexander Coad & Petros Gkotsis, 2015. "The 2015 EU Industrial R&D Investment Scoreboard," JRC Research Reports JRC98287, Joint Research Centre.
    43. Thompson, Peter, 1999. "Rationality, rules of thumb, and R&D," Structural Change and Economic Dynamics, Elsevier, vol. 10(3-4), pages 321-340, December.
    44. Álvaro Escribano & Rodolfo Stucchi, 2014. "Does recession drive convergence in firms’ productivity? Evidence from Spanish manufacturing firms," Journal of Productivity Analysis, Springer, vol. 41(3), pages 339-349, June.
    45. Pietro Moncada-Paternò-Castello & Marco Vivarelli & Peter Voigt, 2011. "Drivers and impacts in the globalization of corporate R&D: an introduction based on the European experience," Industrial and Corporate Change, Oxford University Press and the Associazione ICC, vol. 20(2), pages 585-603, April.
    46. Aune, Finn Roar & Mohn, Klaus & Osmundsen, Petter & Rosendahl, Knut Einar, 2010. "Financial market pressure, tacit collusion and oil price formation," Energy Economics, Elsevier, vol. 32(2), pages 389-398, March.
    47. Malerba, Franco, 2002. "Sectoral systems of innovation and production," Research Policy, Elsevier, vol. 31(2), pages 247-264, February.
    48. Alex Coad, 2009. "The Growth of Firms," Books, Edward Elgar Publishing, number 13424.
    49. Grabowski, Henry G & Baxter, Nevins D, 1973. "Rivalry in Industrial Research and Development," Journal of Industrial Economics, Wiley Blackwell, vol. 21(3), pages 209-235, July.
    50. Zvi Griliches, 1984. "R&D, Patents, and Productivity," NBER Books, National Bureau of Economic Research, Inc, number gril84-1.
    51. Hector Hernandez Guevara & Fernando Hervas Soriano & Alexander Tuebke & Antonio Vezzani & Sara Amoroso & Alexander Coad & Petros Gkotsis & Nicola Grassano, 2017. "The 2016 EU Industrial R&D Investment Scoreboard," JRC Research Reports JRC103716, Joint Research Centre.
    52. Brown, James R. & Martinsson, Gustav & Petersen, Bruce C., 2017. "What promotes R&D? Comparative evidence from around the world," Research Policy, Elsevier, vol. 46(2), pages 447-462.
    53. Himmelberg, Charles P & Petersen, Bruce C, 1994. "R&D and Internal Finance: A Panel Study of Small Firms in High-Tech Industries," The Review of Economics and Statistics, MIT Press, vol. 76(1), pages 38-51, February.
    54. Andrei Shleifer, 1985. "A Theory of Yardstick Competition," RAND Journal of Economics, The RAND Corporation, vol. 16(3), pages 319-327, Autumn.
    55. Martin Srholec & Bart Verspagen, 2012. "The Voyage of the Beagle into innovation: explorations on heterogeneity, selection, and sectors," Industrial and Corporate Change, Oxford University Press and the Associazione ICC, vol. 21(5), pages 1221-1253, October.
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    Keywords

    R&D investment; R&D intensity; convergence; benchmarking;
    All these keywords.

    JEL classification:

    • O3 - Economic Development, Innovation, Technological Change, and Growth - - Innovation; Research and Development; Technological Change; Intellectual Property Rights
    • L2 - Industrial Organization - - Firm Objectives, Organization, and Behavior

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