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Network Effects, Market Structure and Industry Performance

This paper provides a thorough analysis of oligopolistic markets with positive demand-side network externalities and perfect compatibility. The minimal structure imposed on the model primitives is such that industry output increases in a firm's rivals' total output as well as in the expected network size. This leads to a generalized equilibrium existence treatment that includes guarantees for a nontrivial equilibrium, and some insight into possible multiplicity of equilibria. We formalize the concept of industry viability and show that it is always enhanced by having more firms in the market. We also characterize the effects of market structure on industry performance, with an emphasis on departures from standard markets. As per-firm profits need not be monotonic in the number of competitors, we revisit the concept of free entry equilibrium for network industries. The approach relies on lattice-theoretic methods, which allow for a unified treatment of various general results in the literature on network goods. Several illustrative examples with closed-form solutions are also provided.

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File URL: http://www.netinst.org/Amir_Lazzati_09-27.pdf
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Paper provided by NET Institute in its series Working Papers with number 09-27.

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Length: 48 pages
Date of creation: Sep 2009
Date of revision:
Handle: RePEc:net:wpaper:0927
Contact details of provider: Web page: http://www.NETinst.org/

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  5. Amir, Rabah, 1996. "Cournot Oligopoly and the Theory of Supermodular Games," Games and Economic Behavior, Elsevier, vol. 15(2), pages 132-148, August.
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  8. Jean J., GABSZEWICZ & Filomena, GARCIA, 2005. "A Note on Expanding Networks and Monopoly Pricing," Discussion Papers (ECON - Département des Sciences Economiques) 2005063, Université catholique de Louvain, Département des Sciences Economiques.
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  16. Matthew Mitchell & Andrzej Skrzypacz, 2006. "Network externalities and long-run market shares," Economic Theory, Springer, vol. 29(3), pages 621-648, November.
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  19. Jiawei Chen & Ulrich Doraszelski & Joseph E. Harrington, Jr., 2008. "Avoiding Market Dominance: Product Compatibility in Markets with Network Effects," Economics Working Paper Archive 537, The Johns Hopkins University,Department of Economics.
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  29. Matutes, Carmen & Vives, Xavier, 1996. "Competition for Deposits, Fragility, and Insurance," Journal of Financial Intermediation, Elsevier, vol. 5(2), pages 184-216, April.
  30. Milgrom, Paul & Roberts, John, 1990. "Rationalizability, Learning, and Equilibrium in Games with Strategic Complementarities," Econometrica, Econometric Society, vol. 58(6), pages 1255-77, November.
  31. Delgado, Juan & Moreno, Diego, 2004. "Coalition-proof supply function equilibria in oligopoly," Journal of Economic Theory, Elsevier, vol. 114(2), pages 231-254, February.
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  33. Xavier Vives, 2001. "Oligopoly Pricing: Old Ideas and New Tools," MIT Press Books, The MIT Press, edition 1, volume 1, number 026272040x, June.
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