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      Simulation of a Hirschman-Herfindahl index without complete market share information.

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      Health economics

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          Abstract

          This paper utilizes maximum likelihood methods to simulate a Hirschman-Herfindahl index (HHI) for markets in which complete market share information is unavailable or delayed. Many jurisdictions either may be unable to administratively collect data or experience delays in collection that make data regarding turbulent markets of limited use. With the development of this method, regulatory authorities monitoring health-care competition or health-care firms can now use market surveys--in which reliable recall is often limited to the largest three or four firms--to produce an on-the-spot measure of market concentration.

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          Author and article information

          Journal
          Health Econ
          Health economics
          1057-9230
          1057-9230
          Jan 2004
          : 13
          : 1
          Affiliations
          [1 ] Department of Economics, State University of New York at Buffalo, USA. eric.nauenberg@utoronto.ca
          Article
          10.1002/hec.814
          14724896
          Copyright 2003 John Wiley & Sons, Ltd.

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