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Duopoly with Differentiated Products and Entry Barriers

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Abstract

Product differentiated duopoly with a potential entrant facing a single period fixed cost entry barriers is modeled as a noncooperative game. In addition to characterizing the equilibrium solutions and relating them to entry costs and product differentiation, a comparison of price and quantity competition shows that entry conditions are qualitatively sensitive to the strategic variables used in a given industry. Quantity competition appears to be more favorable for entry than price competition. The use of threats and other exclusionary tactics, such as limit pricing, decisively determine the outcome when entry costs are moderate.

Suggested Citation

  • Kofi O. Nti & Martin Shubik, 1981. "Duopoly with Differentiated Products and Entry Barriers," Cowles Foundation Discussion Papers 576, Cowles Foundation for Research in Economics, Yale University.
    • Handle: RePEc:cwl:cwldpp:576
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    File URL: https://cowles.yale.edu/sites/default/files/files/pub/d05/d0576.pdf
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    1. Kamien, Morton I & Schwartz, Nancy L, 1971. "Limit Pricing and Uncertain Entry," Econometrica, Econometric Society, vol. 39(3), pages 441-454, May.
    2. A. Michael Spence, 1977. "Entry, Capacity, Investment and Oligopolistic Pricing," Bell Journal of Economics, The RAND Corporation, vol. 8(2), pages 534-544, Autumn.
    3. Avinash Dixit, 1979. "A Model of Duopoly Suggesting a Theory of Entry Barriers," Bell Journal of Economics, The RAND Corporation, vol. 10(1), pages 20-32, Spring.
    4. Gaskins, Darius Jr., 1971. "Dynamic limit pricing: Optimal pricing under threat of entry," Journal of Economic Theory, Elsevier, vol. 3(3), pages 306-322, September.
    5. Levitan, Richard & Shubik, Martin, 1972. "Price Duopoly and Capacity Constraints," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 13(1), pages 111-122, February.
    6. Paul M. Sweezy, 1939. "Demand Under Conditions of Oligopoly," Journal of Political Economy, University of Chicago Press, vol. 47(4), pages 568-568.
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    1. Shubik, Martin, 1985. "The many approaches to the study of monopolistic competition," European Economic Review, Elsevier, vol. 27(1), pages 97-114, February.
    2. Cellini, Roberto & Lambertini, Luca & Ottaviano, Gianmarco I. P., 2004. "Welfare in a differentiated oligopoly with free entry: a cautionary note," Research in Economics, Elsevier, vol. 58(2), pages 125-133, June.

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