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A Note on the Excess Entry Theorem in Spatial Models with Elastic Demand

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  • Gu, Yiquan
  • Wenzel, Tobias

Abstract

This paper revisits the excess entry theorem in spatial models à la Vickrey (1964) and Salop (1979) while relaxing the assumption of inelastic demand. Using a demand function with a constant demand elasticity, we show that the number of firms that enter a market decreases with the degree of demand elasticity.We find that the excess entry theorem does only hold when demand is sufficiently inelastic. Otherwise, there is insufficient entry. In the limiting case of unit elastic demand, the market is monopolized. We point out when and how a public policy can be desirable and broaden our results with a more general transportation cost function.

Suggested Citation

  • Gu, Yiquan & Wenzel, Tobias, 2007. "A Note on the Excess Entry Theorem in Spatial Models with Elastic Demand," Ruhr Economic Papers 33, RWI - Leibniz-Institut für Wirtschaftsforschung, Ruhr-University Bochum, TU Dortmund University, University of Duisburg-Essen.
    • Handle: RePEc:zbw:rwirep:33
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    References listed on IDEAS

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    More about this item

    Keywords

    Elastic demand; spatial models; excess entry theorem;
    All these keywords.

    JEL classification:

    • L11 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Production, Pricing, and Market Structure; Size Distribution of Firms
    • L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets

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