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The Dynamics of Market Structure and Market Size in Two Health Services Industries

  • Timothy Dunne
  • Mark Roberts
  • Shawn Klimek
  • Yi Xu

The relationship between the size of a market and the competitiveness of the market has been of long-standing interest to IO economists. Empirical studies have used the relationship between the size of the geographic market and both the number of firms in the market and the average sales of the firms to draw inferences about the degree of competition in the market. This paper extends this framework to incorporate the analysis of entry and exit flows. A key implication of recent entry and exit models is that current market structure will likely depend upon history of past participation. The paper explores these issues empirically by examining producer dynamics for two health service industries, dentistry and chiropractic services. We find that the number of potential entrants and past number of incumbent firms are correlated with current market structure. The empirical results also show that as market size increases the number of firms rises less than proportionately, firm size increases, and average productivity increases. However, the magnitude of the correlations are sensitive to the inclusion of the market history variables.

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File URL: ftp://ftp2.census.gov/ces/wp/2007/CES-WP-07-26.pdf
File Function: First version, 2007
Download Restriction: no

Paper provided by Center for Economic Studies, U.S. Census Bureau in its series Working Papers with number 07-26.

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Length: 35 pages
Date of creation: Oct 2007
Date of revision:
Handle: RePEc:cen:wpaper:07-26
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  1. Berry, Steven & Waldfogel, Joel, 2005. "Product Quality and Market Size," Working Papers 1, Yale University, Department of Economics.
  2. Allan Collard-Wexler, 2006. "Plant Turnover and Demand Fluctuations in the Ready-Mix Concrete Industry," Working Papers 06-08, Center for Economic Studies, U.S. Census Bureau.
  3. Pesendorfer, Martin & Schmidt-Dengler, Philipp, 2003. "Identification and Estimation of Dynamic Games," CEPR Discussion Papers 3965, C.E.P.R. Discussion Papers.
  4. Asplund, Marcus & Sandin, Rickard, 1999. "The Number of Firms and Production Capacity in Relation to Market Size," Journal of Industrial Economics, Wiley Blackwell, vol. 47(1), pages 69-85, March.
  5. Jeffrey R. Campbell & Hugo A. Hopenhayn, 2005. "Market Size Matters," Journal of Industrial Economics, Wiley Blackwell, vol. 53(1), pages 1-25, 03.
  6. Chad Syverson, 2004. "Market Structure and Productivity: A Concrete Example," Journal of Political Economy, University of Chicago Press, vol. 112(6), pages 1181-1222, December.
  7. Hopenhayn, Hugo A, 1992. "Entry, Exit, and Firm Dynamics in Long Run Equilibrium," Econometrica, Econometric Society, vol. 60(5), pages 1127-50, September.
  8. Sanghamitra Das & Mark J. Roberts & James R. Tybout, 2007. "Market Entry Costs, Producer Heterogeneity, and Export Dynamics," Econometrica, Econometric Society, vol. 75(3), pages 837-873, 05.
  9. Ariel Pakes & Michael Ostrovsky & Steven Berry, 2007. "Simple estimators for the parameters of discrete dynamic games (with entry/exit examples)," RAND Journal of Economics, RAND Corporation, vol. 38(2), pages 373-399, 06.
  10. Marcus Asplund & Volker Nocke, 2006. "Firm Turnover in Imperfectly Competitive Markets -super-1," Review of Economic Studies, Oxford University Press, vol. 73(2), pages 295-327.
  11. Timothy F. BRESNAHAN & Peter C.REISS, 1994. "Measuring the Importance of Sunk Costs," Annales d'Economie et de Statistique, ENSAE, issue 34, pages 181-217.
  12. Ron S Jarmin & Javier Miranda, 2002. "The Longitudinal Business Database," Working Papers 02-17, Center for Economic Studies, U.S. Census Bureau.
  13. Berry, Steven T, 1992. "Estimation of a Model of Entry in the Airline Industry," Econometrica, Econometric Society, vol. 60(4), pages 889-917, July.
  14. Bresnahan, T.F & Reiss, P.C., 1989. "Entry And Competition In Concentrated Markets," Papers 151, Stanford - Studies in Industry Economics.
  15. Victor Aguirregabiria & Pedro Mira, 2004. "Sequential Estimation Of Dynamic Discrete Games," Working Papers wp2004_0413, CEMFI.
  16. Berry, Steven & Reiss, Peter, 2007. "Empirical Models of Entry and Market Structure," Handbook of Industrial Organization, Elsevier.
  17. Marcus Asplund & Volker Nocke, 2003. "Firm Turnover in Imperfectly Competitive Markets," PIER Working Paper Archive 03-010, Penn Institute for Economic Research, Department of Economics, University of Pennsylvania.
  18. Timothy F. Bresnahan & Peter C. Reiss, 1987. "Do Entry Conditions Vary across Markets?," Brookings Papers on Economic Activity, Economic Studies Program, The Brookings Institution, vol. 18(3), pages 833-882.
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