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Competition in two-sided markets with common network externalities

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  • Bardey, David
  • Cremer, Helmuth
  • Lozachmeur, Jean-Marie

Abstract

We study competition in two sided markets with common network externality rather than with the standard inter-group effects. This type of externality occurs when both groups benefit, possibly with different intensities, from an increase in the size of one group and from a decrease in the size of the other. We explain why common externality is relevant for the health and education sectors. We focus on the symmetric equilibrium and show that when the externality itself satisfies an homogeneity condition then platforms’ profits and price structure have some specific 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 specific but realistic case where the common network externality is homogeneous of degree zero, platform's profit 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 affected but in such a way that platforms only transfer rents from consumers to providers.

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Bibliographic Info

Paper provided by Toulouse School of Economics (TSE) in its series TSE Working Papers with number 09-103.

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Date of creation: Oct 2009
Date of revision: Oct 2010
Publication status: Published in Review of Industrial Organization.
Handle: RePEc:tse:wpaper:21963

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  1. Ma, Ching-to Albert, 1994. "Health Care Payment Systems: Cost and Quality Incentives," Journal of Economics & Management Strategy, Wiley Blackwell, vol. 3(1), pages 93-112, Spring.
  2. Rochet, Jean-Charles & Tirole, Jean, 2003. "Platform Competition in Two-Sided Markets," IDEI Working Papers 152, Institut d'Économie Industrielle (IDEI), Toulouse.
  3. BELLEFLAMME, Paul & TOULEMONDE, Eric, . "Negative intra-group externalities in two-sided markets," CORE Discussion Papers RP -2119, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  4. Alan B. Krueger, 2002. "Economic Considerations and Class Size," NBER Working Papers 8875, National Bureau of Economic Research, Inc.
  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..
  6. David Bardey & Jean-Charles Rochet, 2009. "Competition among health plans: a two-sided market approach," DOCUMENTOS DE TRABAJO 005217, UNIVERSIDAD DEL ROSARIO.
  7. Kurucu, Gokce, 2007. "Negative Network Externalities in Two-Sided Markets: A Competition Approach," MPRA Paper 9746, University Library of Munich, Germany.
  8. repec:rje:randje:v:37:y:2006:3:p:668-691 is not listed on IDEAS
  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.
  10. Gaynor, Martin & Pauly, Mark V, 1990. "Compensation and Productive Efficiency of Partnerships: Evidence from Medical Group Practice," Journal of Political Economy, University of Chicago Press, vol. 98(3), pages 544-73, June.
  11. repec:rje:randje:v:37:y:2006:3:p:645-667 is not listed on IDEAS
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Cited by:
  1. Herr, Annika, 2010. "Quality and welfare in a mixed duopoly with regulated prices: The case of a public and a private hospital," DICE Discussion Papers 07, Heinrich‐Heine‐Universität Düsseldorf, Düsseldorf Institute for Competition Economics (DICE).

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