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When Different Market Concentration Indices Agree

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  • Hennessy, David
  • Lapan, Harvey

Abstract

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.

Suggested Citation

  • Hennessy, David & Lapan, Harvey, 2006. "When Different Market Concentration Indices Agree," ISU General Staff Papers 202410291651270000, Iowa State University, Department of Economics.
    • Handle: RePEc:isu:genstf:202410291651270000
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    References listed on IDEAS

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    Cited by:

    1. Hrazdil, Karel & Zhang, Ray, 2012. "The importance of industry classification in estimating concentration ratios," Economics Letters, Elsevier, vol. 114(2), pages 224-227.
    2. ZHANG, Lu & GUO, Qing & ZHANG, Junbiao & HUANG, Yong & XIONG, Tao, 2015. "Did China׳s rare earth export policies work? — Empirical evidence from USA and Japan," Resources Policy, Elsevier, vol. 43(C), pages 82-90.
    3. Baum, Leonard & Bryson, Joanna J., 2024. "Policy lessons from China: A quantitative examination of China's new competition regime for the digital economy," SocArXiv zyc6s, Center for Open Science.
    4. Darko Tipurić & Mirjana Pejić Bach, 2009. "Changes in Industrial Concentration in the Croatian Economy (1995-2006)," EFZG Working Papers Series 0903, Faculty of Economics and Business, University of Zagreb.
    5. Mohammed, Nafisah & ismail, abdul & Muhammad, Junaina, 2016. "Concentration and Competition in Dual Banking Industry: A Structural Approach," Jurnal Ekonomi Malaysia, Faculty of Economics and Business, Universiti Kebangsaan Malaysia, vol. 50(2), pages 49-70.
    6. Satya R. Chakravarty & Palash Sarkar, 2021. "An inequality paradox: relative versus absolute indices?," METRON, Springer;Sapienza Università di Roma, vol. 79(2), pages 241-254, August.

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