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Strategic Supply Function Competition with Private Information

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Author Info
Xavier Vives (IESE Business School and UPF)
Abstract

A finite number of sellers (n) compete in schedules to supply an elastic demand. The costs of the sellers have uncertain common and private value components and there is no exogenous noise in the system. A Bayesian supply function equilibrium is characterized; the equilibrium is privately revealing and the incentives to acquire information are preserved. Price-cost margins and bid shading are affected by the parameters of the information structure: supply functions are steeper with more noise in the private signals or more correlation among the costs parameters. In fact, for large values of noise or correlation supply functions are downward sloping, margins are larger than the Cournot ones, and as we approach the common value case they tend to the collusive level. Private information coupled with strategic behavior induces additional distortionary market power above full information levels and welfare losses which can be counteracted by subsidies. As the market grows large the equilibrium becomes price-taking, bid shading is of the order of 1/n, and the order of magnitude of welfare losses is I/n^2. The results extend to demand schedule competition and a range of applications in product and financial markets are presented.

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Paper provided by Cowles Foundation, Yale University in its series Cowles Foundation Discussion Papers with number 1736.

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Length: 79 pages
Date of creation: Oct 2009
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Handle: RePEc:cwl:cwldpp:1736

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Related research
Keywords: Reverse auction; Demand schedule competition; Market power; Adverse selection; Competitiveness; Rational expectations; Collusion; Welfare;

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Find related papers by JEL classification:
L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets
D44 - Microeconomics - - Market Structure and Pricing - - - Auctions
D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information
G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies
L94 - Industrial Organization - - Industry Studies: Transportation and Utilities - - - Electric Utilities
E58 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Central Banks and Their Policies
F13 - International Economics - - Trade - - - Trade Policy; International Trade Organizations

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