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Computing welfare losses from data under imperfect competition with heterogeneous goods

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Author Info
Luis C. Corchon
Galina Zudenkova ()

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Abstract

We study the percentage of welfare losses (PWL) yielded by imperfect competition under product differentiation. When demand is linear, if prices, outputs, costs and the number of firms can be observed, PWL is arbitrary in both Cournot and Bertrand equilibria. If in addition, the elasticity of demand (resp. cross elasticity of demand) is known, we can calculate PWL in Cournot (resp. Bertrand) equilibrium. When demand is isoelastic and there are many firms, PWL can be computed from prices, outputs, costs and the number of .rms. In all these cases we find that price-marginal cost margins and demand elasticities may influence PWL in a counterintuitive way. We also provide conditions under which PWL increases or decreases with concentration.

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Publisher Info
Paper provided by Universidad Carlos III, Departamento de Economía in its series Economics Working Papers with number we082616.

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Date of creation: May 2008
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Handle: RePEc:cte:werepe:we082616

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Related research
Keywords: Welfare losses; Product differentiation; Cournot equilibrium; Bertrand equilibrium;

Find related papers by JEL classification:
D61 - Microeconomics - - Welfare Economics - - - Allocative Efficiency; Cost-Benefit Analysis
L11 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Production, Pricing, and Market Structure; Size Distribution of Firms
L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets
L50 - Industrial Organization - - Regulation and Industrial Policy - - - General

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  1. Nirvikar Singh & Xavier Vives, 1984. "Price and Quantity Competition in a Differentiated Duopoly," RAND Journal of Economics, The RAND Corporation, vol. 15(4), pages 546-554, Winter. [Downloadable!] (restricted)
  2. Judy Hsu & X. Wang, 2005. "On Welfare under Cournot and Bertrand Competition in Differentiated Oligopolies," Review of Industrial Organization, Springer, vol. 27(2), pages 185-191, 09. [Downloadable!] (restricted)
  3. X. Henry Wang & Judy Hsu, 2005. "On Welfare under Cournot and Bertrand Competition in Differentiated Oligopolies," Working Papers 0514, Department of Economics, University of Missouri. [Downloadable!]
  4. Lahiri, Sajal & Ono, Yoshiyasu, 1988. "Helping Minor Firms Reduces Welfare," Economic Journal, Royal Economic Society, vol. 98(393), pages 1199-1202, December. [Downloadable!] (restricted)
  5. Hackner, Jonas, 2000. "A Note on Price and Quantity Competition in Differentiated Oligopolies," Journal of Economic Theory, Elsevier, vol. 93(2), pages 233-239, August. [Downloadable!] (restricted)
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  6. Spence, Michael, 1976. "Product Selection, Fixed Costs, and Monopolistic Competition," Review of Economic Studies, Blackwell Publishing, vol. 43(2), pages 217-35, June. [Downloadable!] (restricted)
  7. Daughety, Andrew F, 1990. "Beneficial Concentration," American Economic Review, American Economic Association, vol. 80(5), pages 1231-37, December. [Downloadable!] (restricted)
  8. Farrell, Joseph & Shapiro, Carl, 1990. "Horizontal Mergers: An Equilibrium Analysis," American Economic Review, American Economic Association, vol. 80(1), pages 107-26, March. [Downloadable!] (restricted)
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  9. Corchón, Luis C., 2008. "Welfare losses under Cournot competition," International Journal of Industrial Organization, Elsevier, vol. 26(5), pages 1120-1131, September. [Downloadable!] (restricted)
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  10. McHardy, J.P., 2000. "Miscalculations of Monopoly and Oligopoly Welfare Losses with Linear Demand," Papers 274, Universite de Nantes - Economie Internationale et de l'Entreprise.
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