When Different Market Concentration Indices Agree
Market concentration ratios are popular statistics for characterizing the extent of market dominance in an imperfectly competitive market, but these ratios may not agree when comparing two markets. Neither do they necessarily agree with the Herfindahl-Hirschman or entropy indices. This letter compares two Cournot oligopoly markets in which firms have constant unit costs. It is shown that the majorization pre-ordering on normalized marketing margin vectors is both necessary and sufficient for all aforementioned indices to agree on which is the more concentrated market.
|Date of creation:||23 Mar 2006|
|Date of revision:|
|Publication status:||Published in Economics Letters, May 2007, vol. 95, pp. 234-240|
|Contact details of provider:|| Postal: Iowa State University, Dept. of Economics, 260 Heady Hall, Ames, IA 50011-1070|
Phone: +1 515.294.6741
Fax: +1 515.294.0221
Web page: http://www.econ.iastate.edu
More information through EDIRC
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
- Howitt, Peter & Griffith, Rachel & Aghion, Philippe & Blundell, Richard & Bloom, Nick, 2005.
"Competition and Innovation: An Inverted-U Relationship,"
4481507, Harvard University Department of Economics.
- Philippe Aghion & Nick Bloom & Richard Blundell & Rachel Griffith & Peter Howitt, 2005. "Competition and Innovation: an Inverted-U Relationship," The Quarterly Journal of Economics, Oxford University Press, vol. 120(2), pages 701-728.
- Philippe Aghion & Nicholas Bloom & Richard Blundell & Rachel Griffith & Peter Howitt, 2002. "Competition and Innovation: An Inverted U Relationship," NBER Working Papers 9269, National Bureau of Economic Research, Inc.
- Philippe Aghion & Nicholas Bloom & Richard Blundell & Rachel Griffith & Peter Howitt, 2002. "Competition and innovation: an inverted U relationship," IFS Working Papers W02/04, Institute for Fiscal Studies.
- Greg Shaffer & Stephen W. Salant, 1999. "Unequal Treatment of Identical Agents in Cournot Equilibrium," American Economic Review, American Economic Association, vol. 89(3), pages 585-604, June.
- Dasgupta, Partha & Sen, Amartya & Starrett, David, 1973. "Notes on the measurement of inequality," Journal of Economic Theory, Elsevier, vol. 6(2), pages 180-187, April.
- Chambers,Robert G. & Quiggin,John, 2000.
"Uncertainty, Production, Choice, and Agency,"
Cambridge University Press, number 9780521622448, June.
- Harvey E. Lapan & David A. Hennessy, 2002.
"Symmetry and order in the portfolio allocation problem,"
Springer;Society for the Advancement of Economic Theory (SAET), vol. 19(4), pages 747-772.
- Lapan, Harvey E. & Hennessy, David A., 2002. "Symmetry and Order in the Portfolio Allocation Problem," Staff General Research Papers 5106, Iowa State University, Department of Economics.
- Shorrocks, Anthony F, 1983. "Ranking Income Distributions," Economica, London School of Economics and Political Science, vol. 50(197), pages 3-17, February.
- Zhao, Jingang, 2001.
"A characterization for the negative welfare effects of cost reduction in Cournot oligopoly,"
International Journal of Industrial Organization,
Elsevier, vol. 19(3-4), pages 455-469, March.
- Jingang Zhao, 1999. "A Characterization of the Negative Welfare Effects of Cost Reduction in Cournot Oligopoly," Working Papers 99-06, Ohio State University, Department of Economics.
- Efe A. Ok, 1997. "A note on the existence of progressive tax structures," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 14(4), pages 527-543.
When requesting a correction, please mention this item's handle: RePEc:isu:genres:12550. See general information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Curtis Balmer)
If references are entirely missing, you can add them using this form.