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On the Social Desirability of Patents for Sequential Innovations in a Vertically Differentiated Market

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Author Info

  • Luca Lambertini

    ()

  • Piero Tedeschi

    ()

Abstract

We consider a market for vertically differentiated goods where firms enter over time, after having developed innovations characterised by different quality levels. We show that patent height and length interact to determine the ultimate emergence of duopoly. In general, imposing quality improvements on later entrants entails the persistence of monopoly, while a duopoly equilibrium emerges when the second innovator is allowed to produce a sufficiently inferior quality and the patent protection granted to the first innovator is not too long-lasting.

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File URL: http://hdl.handle.net/10.1007/s00712-006-0231-5
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Bibliographic Info

Article provided by Springer in its journal Journal of Economics.

Volume (Year): 90 (2007)
Issue (Month): 2 (March)
Pages: 193-214

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Handle: RePEc:kap:jeczfn:v:90:y:2007:i:2:p:193-214

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Web page: http://www.springerlink.com/link.asp?id=108909

Related research

Keywords: innovation; patent height; product quality; L12; L13; O31;

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References

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  1. Jaskold Gabszewicz, J. & Thisse, J. -F., 1980. "Entry (and exit) in a differentiated industry," Journal of Economic Theory, Elsevier, vol. 22(2), pages 327-338, April.
  2. Motta, Massimo, 1992. "Cooperative R&D and vertical product differentiation," International Journal of Industrial Organization, Elsevier, vol. 10(4), pages 643-661, December.
  3. Choi, Chong Ju & Shin, Hyun Song, 1992. "A Comment on a Model of Vertical Product Differentiation," Journal of Industrial Economics, Wiley Blackwell, vol. 40(2), pages 229-31, June.
  4. Rosenkranz, Stephanie, 1995. "Innovation and cooperation under vertical product differentiation," International Journal of Industrial Organization, Elsevier, vol. 13(1), pages 1-22, March.
  5. James Bessen & Eric Maskin, 2006. "Sequential Innovation, Patents, and Imitation," Economics Working Papers 0025, Institute for Advanced Study, School of Social Science.
  6. Paul Klemperer, 1990. "How Broad Should the Scope of Patent Protection Be?," RAND Journal of Economics, The RAND Corporation, vol. 21(1), pages 113-130, Spring.
  7. Jaskold Gabszewicz, J. & Thisse, J. -F., 1979. "Price competition, quality and income disparities," Journal of Economic Theory, Elsevier, vol. 20(3), pages 340-359, June.
  8. Rosenkranz, Stephanie, 1997. "Quality improvements and the incentive to leapfrog," International Journal of Industrial Organization, Elsevier, vol. 15(2), pages 243-261, April.
  9. Beath, John & Katsoulacos, Yannis & Ulph, David, 1987. "Sequential Product Innovation and Industry Evolution," Economic Journal, Royal Economic Society, vol. 97(388a), pages 32-43, Supplemen.
  10. Donnenfeld, Shabtai & Weber, Shlomo, 1992. "Vertical product differentiation with entry," International Journal of Industrial Organization, Elsevier, vol. 10(3), pages 449-472, September.
  11. Motta, Massimo, 1993. "Endogenous Quality Choice: Price vs. Quantity Competition," Journal of Industrial Economics, Wiley Blackwell, vol. 41(2), pages 113-31, June.
  12. Prajit K. Dutta & Saul Lach & Aldo Rustichini, 1993. "Better Late Than Early: Vertical Differentiation in the Adoption of a New Technology," NBER Working Papers 4473, National Bureau of Economic Research, Inc.
  13. Aoki, Reiko & Prusa, Thomas J., 1997. "Sequential versus simultaneous choice with endogenous quality," International Journal of Industrial Organization, Elsevier, vol. 15(1), pages 103-121, February.
  14. Shaked, Avner & Sutton, John, 1982. "Relaxing Price Competition through Product Differentiation," Review of Economic Studies, Wiley Blackwell, vol. 49(1), pages 3-13, January.
  15. Suzanne Scotchmer, 1991. "Standing on the Shoulders of Giants: Cumulative Research and the Patent Law," Journal of Economic Perspectives, American Economic Association, vol. 5(1), pages 29-41, Winter.
  16. Shaked, Avner & Sutton, John, 1983. "Natural Oligopolies," Econometrica, Econometric Society, vol. 51(5), pages 1469-83, September.
  17. Lambertini, Luca, 1999. "Endogenous timing and the choice of quality in a vertically differentiated duopoly," Research in Economics, Elsevier, vol. 53(1), pages 101-109, March.
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Citations

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Cited by:
  1. E. Bacchiega & L. Lambertini & A. Mantovani, 2007. "Process and product innovation in a vertically differentiated industry," Working Papers 583, Dipartimento Scienze Economiche, Universita' di Bologna.
  2. Colombo, Stefano, 2009. "On the effects of selective below-cost pricing in a vertical differentiation model," Economics - The Open-Access, Open-Assessment E-Journal, Kiel Institute for the World Economy, vol. 3(33), pages 1-13.

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