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Market Coverage and the Existence of Equilibrium in a Vertically Differentiated Duopoly

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  • G. Ecchia
  • L. Lambertini

Abstract

The existence of a pure-strategy subgame perfect equilibrium in qualities and prices is investigated in a duopoly model of vertical differentiation where quality improvements require a quadratic variable cost. The alternative cases of partial and full market coverage are considered. It is shown that there exists a parameter range where the incentive to decrease differentiation arises for the high-quality firm, preventing firms to reach a pure-strategy duopoly equilibrium.

Suggested Citation

  • G. Ecchia & L. Lambertini, 1998. "Market Coverage and the Existence of Equilibrium in a Vertically Differentiated Duopoly," Working Papers 311, Dipartimento Scienze Economiche, Universita' di Bologna.
    • Handle: RePEc:bol:bodewp:311
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    Cited by:

    1. Klarl, Torben, 2013. "Consumer's Environmental Awareness and the Role of (Green) Entrepreneurship: Lessons from Environmental Quality Competition and R&D Activities for Environmental Policy," VfS Annual Conference 2013 (Duesseldorf): Competition Policy and Regulation in a Global Economic Order 79729, Verein für Socialpolitik / German Economic Association.
    2. C. Lombardini-Riipinen, 2005. "Optimal Tax Policy under Environmental Quality Competition," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 32(3), pages 317-336, November.
    3. M. Alvisi, 2000. "Quality Choice, Fixed Costs and Equilibrium in Models of Vertical Differentiation ," Working Papers 437, Dipartimento Scienze Economiche, Universita' di Bologna.

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