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Product Variety, Price Elasticity of Demand and Fixed Cost in Spatial Models

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  • Yiquan Gu

    ()

  • Tobias Wenzel

    ()

Abstract

This paper explores the implications of price-dependent demand in spatial models of product differentiation.We introduce consumers with a quasi-linear utility function in the framework of the Salop (1979) model.We show that the so-called excess entry theorem relies critically on the assumption of completely inelastic demand. Our model is able to produce excessive, insufficient, or optimal product variety.A proof for the existence and uniqueness of symmetric equilibrium when price elasticity of demand is increasing in price is also provided.

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File URL: http://repec.rwi-essen.de/files/REP_09_092.pdf
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Bibliographic Info

Paper provided by Rheinisch-Westfälisches Institut für Wirtschaftsforschung, Ruhr-Universität Bochum, Universität Dortmund, Universität Duisburg-Essen in its series Ruhr Economic Papers with number 0092.

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Length: 28 pages
Date of creation: Mar 2009
Date of revision:
Handle: RePEc:rwi:repape:0092

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Keywords: Demand elasticity; spatial models; excess entry theorem;

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  1. Economides, Nicholas, 1989. "Symmetric equilibrium existence and optimality in differentiated product markets," Journal of Economic Theory, Elsevier, vol. 47(1), pages 178-194, February.
  2. Gu, Yiquan & Wenzel, Tobias, 2009. "A note on the excess entry theorem in spatial models with elastic demand," International Journal of Industrial Organization, Elsevier, vol. 27(5), pages 567-571, September.
  3. Simon P. Anderson & Andre de Palma, 1998. "From Local to Global Competition," Virginia Economics Online Papers 344, University of Virginia, Department of Economics.
  4. Martin Peitz, 2002. "Price equilibrium in address models of product differentiation: unit-elastic demand," Economic Theory, Springer, vol. 20(4), pages 849-860.
  5. Matsumura, Toshihiro & Okamura, Makoto, 2006. "A note on the excess entry theorem in spatial markets," International Journal of Industrial Organization, Elsevier, vol. 24(5), pages 1071-1076, September.
  6. Martin A. Lariviere & Evan L. Porteus, 2001. "Selling to the Newsvendor: An Analysis of Price-Only Contracts," Manufacturing & Service Operations Management, INFORMS, vol. 3(4), pages 293-305, May.
  7. Bockem, Sabine, 1994. "A Generalized Model of Horizontal Product Differentiation," Journal of Industrial Economics, Wiley Blackwell, vol. 42(3), pages 287-98, September.
  8. Dixit, Avinash K & Stiglitz, Joseph E, 1977. "Monopolistic Competition and Optimum Product Diversity," American Economic Review, American Economic Association, vol. 67(3), pages 297-308, June.
  9. Rath, Kali P. & Zhao, Gongyun, 2001. "Two stage equilibrium and product choice with elastic demand," International Journal of Industrial Organization, Elsevier, vol. 19(9), pages 1441-1455, November.
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Cited by:
  1. Gu, Yiquan & Wenzel, Tobias, 2010. "Transparency, price-dependent demand and product variety," DICE Discussion Papers 04, Heinrich‐Heine‐Universität Düsseldorf, Düsseldorf Institute for Competition Economics (DICE).
  2. Stühmeier, Torben & Wenzel, Tobias, 2011. "Getting beer during commercials: Adverse effects of ad-avoidance," Information Economics and Policy, Elsevier, vol. 23(1), pages 98-106, March.

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