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Competition in two-sided markets with common network externalities

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  • Helmuth Cremer

    ()

  • David Bardey
  • Jean-Marie Lozachmeur

    ()

Abstract

We study competition in two sided markets with common network externality rather than with the standard inter-group e¤ects. This type of externality occurs when both groups bene�t, possibly with di¤erent intensities, from an increase in the size of one group and from a decrease in the size of the other. We explain why common externalityis relevant for the health and education sectors. We focus on the symmetric equilibrium and show that when the externality itself satis�es an homogeneity condition then platforms� pro�ts and price structure have some speci�c properties. Our results reveal how the rents coming from network externalities are shifted by platforms from one side to other, according to the homogeneity degree. In the speci�c but realistic case where the common network externality is homogeneous of degree zero, platform�s pro�t do not depend on the intensity of the (common) network externality. This is in sharp contrast to conventional results stating that the presence of network externalities in a two-sided market structure increases the intensity of competition when the externality is positive (and decreases it when the externality is negative). Prices are a¤ected but in such a way that platforms only transfer rents from consumers to providers

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Bibliographic Info

Paper provided by UNIVERSIDAD DEL ROSARIO in its series DOCUMENTOS DE TRABAJO with number 005937.

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Date of creation: 15 Oct 2009
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Handle: RePEc:col:000092:005937

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Keywords: Two-Sided markets; Common Network Externality; Health; Education;

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  1. BELLEFLAMME, Paul & TOULEMONDE, Eric, 2007. "Negative intra-group externalities in two-sided markets," CORE Discussion Papers 2007039, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
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  3. David Bardey & Jean-Charles Rochet, 2010. "Competition Among Health Plans: A Two-Sided Market Approach," Journal of Economics & Management Strategy, Wiley Blackwell, vol. 19(2), pages 435-451, 06.
  4. Rochet, Jean-Charles & Tirole, Jean, 2003. "Platform Competition in Two-Sided Markets," IDEI Working Papers 152, Institut d'Économie Industrielle (IDEI), Toulouse.
  5. David Card & Alan Krueger, 1990. "Does School Quality Matter? Returns to Education and the Characteristics of Public Schools in the United States," Working Papers 645, Princeton University, Department of Economics, Industrial Relations Section..
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  9. Joshua D. Angrist & Victor Lavy, 1999. "Using Maimonides' Rule To Estimate The Effect Of Class Size On Scholastic Achievement," The Quarterly Journal of Economics, MIT Press, vol. 114(2), pages 533-575, May.
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Cited by:
  1. Annika Herr, 2011. "Quality and Welfare in a Mixed Duopoly with Regulated Prices: The Case of a Public and a Private Hospital," German Economic Review, Verein für Socialpolitik, vol. 12(4), pages 422-437, November.

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