A Structural Approach to Market Definition With an Application to the Hospital Industry
AbstractMarket definition is essential to merger analysis. Because no standard approach to market definition exists, opposing parties in antitrust cases often disagree about the extent of the market. These differences have been particularly relevant in the hospital industry, where the courts have denied seven of eight merger challenges since 1994, due largely to disagreements over geographic market definition. We compare geographic markets produced using common ad hoc methodologies to a method that directly applies the “SSNIP test” to hospitals in California using a structural model. Our results suggest that previously employed methods overstate hospital demand elasticities by a factor of 2.4 to 3.4 and define larger markets than would be implied by the merger guidelines’s hypothetical monopolist test. The use of these methods in differentiated product industries may lead to mistaken geographic market delineation, and was likely a contributing factor to the permissive legal environment for hospital mergers.
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Bibliographic InfoPaper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 16656.
Date of creation: Jan 2011
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Other versions of this item:
- Martin S. Gaynor & Samuel A. Kleiner & William B. Vogt, 2013. "A Structural Approach to Market Definition With an Application to the Hospital Industry," Journal of Industrial Economics, Wiley Blackwell, vol. 61(2), pages 243-289, 06.
- I11 - Health, Education, and Welfare - - Health - - - Analysis of Health Care Markets
- K21 - Law and Economics - - Regulation and Business Law - - - Antitrust Law
- L1 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance
- L4 - Industrial Organization - - Antitrust Issues and Policies
This paper has been announced in the following NEP Reports:
- NEP-ALL-2011-01-16 (All new papers)
- NEP-COM-2011-01-16 (Industrial Competition)
- NEP-MKT-2011-01-16 (Marketing)
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.:
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