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

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  • 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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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. van Dijk, Theon, 1996. "Patent Height and Competition in Product Improvements," Journal of Industrial Economics, Wiley Blackwell, vol. 44(2), pages 151-67, June.
  2. GABSZEWICZ, Jean J. & THISSE, Jacques-François, . "Price competition, quality and income disparities," CORE Discussion Papers RP -370, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  3. GABSZEWICZ, Jean J. & THISSE, Jacques-François, . "Entry (and exit) in a differentiated industry," CORE Discussion Papers RP -400, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  4. James Bessen & Eric Maskin, 2009. "Sequential innovation, patents, and imitation," RAND Journal of Economics, RAND Corporation, vol. 40(4), pages 611-635.
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  18. James H. Cardon & Dan Sasaki, 1996. "Pre-emptive Search and R&D Clustering," Discussion Papers 96-21, University of Copenhagen. Department of Economics.
  19. Suzanne Scotchmer, 1996. "Protecting Early Innovators: Should Second-Generation Products Be Patentable?," RAND Journal of Economics, The RAND Corporation, vol. 27(2), pages 322-331, Summer.
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  23. Motta, M., 1991. "Cooperative R&D and vertical product differentiation," CORE Discussion Papers 1991028, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  24. Ulrich Lehmann-Grube, 1997. "Strategic Choice of Quality When Quality is Costly: The Persistence of the High-Quality Advantage," RAND Journal of Economics, The RAND Corporation, vol. 28(2), pages 372-384, Summer.
  25. 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.
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  28. 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. 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.
  2. 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.
  3. L. Lambertini & A. Tampieri, 2011. "Low-Quality Leadership in a Vertically Differentiated Duopoly with Cournot Competition," Working Papers wp750, Dipartimento Scienze Economiche, Universita' di Bologna.
  4. Yi-Ling Cheng & Shin-Kun Peng, 2014. "Price competition and quality differentiation with multiproduct firms," Journal of Economics, Springer, vol. 112(3), pages 207-223, July.

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