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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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File URL: http://www.statistica.unimib.it/utenti/WorkingPapers/WorkingPapers/20060502.pdf
File Function: First version, May 2006
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Bibliographic Info

Paper provided by Università degli Studi di Milano-Bicocca, Dipartimento di Statistica in its series Working Papers with number 20060502.

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Length: 23 pages
Date of creation: May 2006
Date of revision:
Handle: RePEc:mis:wpaper:20060502

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Keywords: innovation; patent height; product quality;

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References

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  1. Donnenfeld, Shabtai & Weber, Shlomo, 1992. "Vertical product differentiation with entry," International Journal of Industrial Organization, Elsevier, vol. 10(3), pages 449-472, September.
  2. 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.
  3. 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.
  4. 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).
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  17. 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).
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  22. 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.
  23. Mansfield, Edwin & Schwartz, Mark & Wagner, Samuel, 1981. "Imitation Costs and Patents: An Empirical Study," Economic Journal, Royal Economic Society, vol. 91(364), pages 907-18, December.
  24. Shaked, Avner & Sutton, John, 1982. "Relaxing Price Competition through Product Differentiation," Review of Economic Studies, Wiley Blackwell, vol. 49(1), pages 3-13, January.
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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. Emanuele Bacchiega & Luca Lambertini & Andrea Mantovaini, 2011. "Process And Product Innovation In A Vertically Differentiated Industry," International Game Theory Review (IGTR), World Scientific Publishing Co. Pte. Ltd., vol. 13(02), pages 209-221.
  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.

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