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Capacity Choice and Duopoly Incentives for Information Sharing


  • William Novshek
  • Lynda Thoman


We examine a three-stage game in which duopolists face a random demand intercept. The firms first choose capacities, then decide whether to commit to share the private information they will receive about the intercept. After the private information is observed, firms choose output levels. Comparing the results to an alternative model without capacity choice or capacity constraints, we show the existence of a capacity choice stage may reverse the incentives to share information, and lead to equilibria in which information sharing occurs. We use binary uncertainty since the common linearnormal model cannot handle capacity constraints. ZUSAMMENFASSUNG - (Kapazitätsentscheidungen und Duopolanreize bei Informationsaustausch) In dem Beitrag wird ein dreistufiges Spiel vorgestellt, in dem sich Duopolisten einer Nachfrage gegenübersehen, die eine Zufallsgröße ist. Die Unternehmen entscheiden auf der ersten Stufe über Kapazitäten, dann können sie sich freiwillig verpflichten, ihre privaten Information auszutauschen, die sie über das Marktvolumen erhalten werden. Nach der Beobachtung der privaten Information entscheiden die Unternehmen über die Angebotsmenge. Ein Vergleich der Ergebnisse dieses Spiels mit einem alternativen Modell ohne Kapazitätsentscheidung oder Kapazitätsbeschränkungen zeigt, daß die Existenz einer Kapazitätsentscheidungsstufe die Anreize zum Austausch von Informationen umkehren und zu Gleichgewichten führen kann, in denen Informationsaustausch stattfindet. In dem Spiel wird Unsicherheit binär modelliert, da das übliche linear-normalverteilte Modell keine Kapazitätsbeschränkungen erfassen kann.

Suggested Citation

  • William Novshek & Lynda Thoman, 1997. "Capacity Choice and Duopoly Incentives for Information Sharing," CIG Working Papers FS IV 97-13, Wissenschaftszentrum Berlin (WZB), Research Unit: Competition and Innovation (CIG).
  • Handle: RePEc:wzb:wzebiv:fsiv97-13

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    References listed on IDEAS

    1. Malueg, David A. & Tsutsui, Shunichi O., 1996. "Duopoly information exchange: The case of unknown slope," International Journal of Industrial Organization, Elsevier, vol. 14(1), pages 119-136.
    2. Richard N. Clarke, 1983. "Collusion and the Incentives for Information Sharing," Bell Journal of Economics, The RAND Corporation, vol. 14(2), pages 383-394, Autumn.
    3. Lode Li, 1985. "Cournot Oligopoly with Information Sharing," RAND Journal of Economics, The RAND Corporation, vol. 16(4), pages 521-536, Winter.
    4. Gal-Or, Esther, 1985. "Information Sharing in Oligopoly," Econometrica, Econometric Society, vol. 53(2), pages 329-343, March.
    5. Alison J. Kirby, 1988. "Trade Associations as Information Exchange Mechanisms," RAND Journal of Economics, The RAND Corporation, vol. 19(1), pages 138-146, Spring.
    6. Raith, Michael, 1996. "A General Model of Information Sharing in Oligopoly," Journal of Economic Theory, Elsevier, vol. 71(1), pages 260-288, October.
    7. William Novshek & Hugo Sonnenschein, 1982. "Fulfilled Expectations Cournot Duopoly with Information Acquisition and Release," Bell Journal of Economics, The RAND Corporation, vol. 13(1), pages 214-218, Spring.
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    oligopoly and other forms of market imperfection; asymmetric and private information;

    JEL classification:

    • D43 - Microeconomics - - Market Structure, Pricing, and Design - - - Oligopoly and Other Forms of Market Imperfection
    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
    • L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets


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