Information Advantage in Cournot Oligopoly with Separable Information, or Nondifferentiable
AbstractEiny et al (2002) showed that information advantage of a firm is rewarded in any equilibrium of an incomplete information Cournot oligopoly, provided the inverse demand function is differentiable and monotonically decreasing, and costs are affine. We extend this result in two directions. We show first that a firm receives not less than its rival even if that firm's information advantage is only regarding payoff-relevant data, and not necessarily payoff-irrelevant "sunspots". We then show that there is at least one equilibrium which rewards firm's information advantage even with non-differentiable, but concave, inverse demand function. Under certain conditions, these results hold even with always non-negative inverse demand functions.
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Bibliographic InfoPaper provided by Graduate School of Economics, Hitotsubashi University in its series Discussion Papers with number 2009-13.
Date of creation: Sep 2009
Date of revision:
Oligopoly; Incomplete Information; Information advantage; Bayesian Cournot; Equilibrium; Sunspots; Non-differentiability; Inverse demand;
Find related papers by JEL classification:
- C72 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Noncooperative Games
- D43 - Microeconomics - - Market Structure and Pricing - - - Oligopoly and Other Forms of Market Imperfection
- L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets
This paper has been announced in the following NEP Reports:
- NEP-ALL-2009-11-21 (All new papers)
- NEP-BEC-2009-11-21 (Business Economics)
- NEP-COM-2009-11-21 (Industrial Competition)
- NEP-CTA-2009-11-21 (Contract Theory & Applications)
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