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Dynamic product diversity

  • Ramon Caminal


The goal of this paper is to study the frequency of new product introductions in monopoly markets where demand is subject to transitory saturation. We focus on those types of goods for which consumers purchase at most one unit of each variety, but repeat purchases in the same product category. The model considers infinitely-lived, forward-looking consumers and firms. We show that the share of potential surplus that a monopolist is able to appropriate increases with the frequency of introduction of new products and the intensity of transitory saturation. If the latter is sufficiently strong then the rate of introduction of new products is higher than socially desirable (excessive dynamic product diversity.)

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Paper provided by Unitat de Fonaments de l'Anàlisi Econòmica (UAB) and Institut d'Anàlisi Econòmica (CSIC) in its series UFAE and IAE Working Papers with number 891.11.

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Length: 31
Date of creation: 12 Dec 2011
Date of revision:
Handle: RePEc:aub:autbar:891.11
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  1. Gary S. Becker, 1991. "A Note on Restaurant Pricing and Other Examples of Social Influences on Price," University of Chicago - George G. Stigler Center for Study of Economy and State 67, Chicago - Center for Study of Economy and State.
  2. Liran Einav, 2007. "Seasonality in the U.S. motion picture industry," RAND Journal of Economics, RAND Corporation, vol. 38(1), pages 127-145, 03.
  3. repec:tpr:qjecon:v:108:y:1993:i:1:p:273-83 is not listed on IDEAS
  4. Jerome Adda & Russell Cooper, 2000. "Balladurette and Juppette: A Discrete Analysis of Scrapping Subsidies," Journal of Political Economy, University of Chicago Press, vol. 108(4), pages 778-806, August.
  5. Armstrong, Mark, 2006. "Price discrimination," MPRA Paper 4693, University Library of Munich, Germany.
  6. Eric W. Bond & Larry Samuelson, 1984. "Durable Good Monopolies with Rational Expectations and Replacement Sales," RAND Journal of Economics, The RAND Corporation, vol. 15(3), pages 336-345, Autumn.
  7. Yongmin Chen & Michael H. Riordan, 2007. "Price and Variety in the Spokes Model," Economic Journal, Royal Economic Society, vol. 117(522), pages 897-921, 07.
  8. Glenn Ellison & Drew Fudenberg, 1999. "The Neo-Luddite's Lament: Excessive Upgrades in the Software Industry," Harvard Institute of Economic Research Working Papers 1870, Harvard - Institute of Economic Research.
  9. de Meza, David & Ungern-Sternberg, Thomas von, 1982. "Monopoly, product diversity and welfare," Regional Science and Urban Economics, Elsevier, vol. 12(3), pages 313-324, August.
  10. Kenneth S. Corts, 2001. "The Strategic Effects of Vertical Market Structure: Common Agency and Divisionalization in the US Motion Picture Industry," Journal of Economics & Management Strategy, Wiley Blackwell, vol. 10(4), pages 509-528, December.
  11. Steven C. Salop, 1979. "Monopolistic Competition with Outside Goods," Bell Journal of Economics, The RAND Corporation, vol. 10(1), pages 141-156, Spring.
  12. Choi, Jay Pil, 1994. "Network Externality, Compatibility Choice, and Planned Obsolescence," Journal of Industrial Economics, Wiley Blackwell, vol. 42(2), pages 167-82, June.
  13. Arthur Fishman & Rafael Rob, 2000. "Product Innovation by a Durable-Good Monpoly," RAND Journal of Economics, The RAND Corporation, vol. 31(2), pages 237-252, Summer.
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