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Unit Roots and the Dynamics of Market Shares: An Analysis Using Italian Banking Micro-Panel

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  • Giannetti, C.

    (Tilburg University, Center for Economic Research)

Abstract

The paper proposes the use of panel data unit root tests to assess market share instability in order to have (preliminary) indications of the industry dynamic. The idea is to consider the movements in market shares not only as element of the market structure but rather reflecting conduct that arise from that market. If shares are mean-reverting, the firm actions only have a temporary effect on shares. On the other hand, if they are evolving, as signaled by the presence of unit roots, the gain in shares respect with the competitors could be long-term. To illustrate the potential of unit roots tests, I consider an application to the Italian retail banking industry.

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Bibliographic Info

Paper provided by Tilburg University, Center for Economic Research in its series Discussion Paper with number 2008-44.

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Date of creation: 2008
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Handle: RePEc:dgr:kubcen:200844

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Web page: http://center.uvt.nl

Related research

Keywords: Turbulence; cross-section dependence;

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  1. Catherine Matraves & Laura Rondi, 2007. "Product Differentiation, Industry Concentration and Market Share Turbulence," International Journal of the Economics of Business, Taylor & Francis Journals, vol. 14(1), pages 37-57.
  2. John Sutton, 2004. "Market Share Dynamics and the ‘Persistence of Leadership’ Debate," STICERD - Economics of Industry Papers 37, Suntory and Toyota International Centres for Economics and Related Disciplines, LSE.
  3. Degryse, H.A. & Ongena, S., 2002. "Distance, Lending Relationships and Competition," Discussion Paper 2002-16, Tilburg University, Center for Economic Research.
  4. S. W. Davies & Paul A. Geroski, 2000. "Changes In Concentration, Turbulence, And The Dynamics Of Market Shares," The Review of Economics and Statistics, MIT Press, vol. 79(3), pages 383-391, August.
  5. Hugo Kruiniger & Elias Tzavalis, 2002. "Testing for Unit Roots in Short Dynamic Panels with Serially Correlated and Heteroscedastic Disturbance Terms," Working Papers 459, Queen Mary, University of London, School of Economics and Finance.
  6. Luigi Guiso & Paola Sapienza & Luigi Zingales, 2004. "Does Local Financial Development Matter?," The Quarterly Journal of Economics, MIT Press, vol. 119(3), pages 929-969, August.
  7. Rafael E. De Hoyos & Vasilis Sarafidis, 2006. "Testing for cross-sectional dependence in panel-data models," Stata Journal, StataCorp LP, vol. 6(4), pages 482-496, December.
  8. Kim, Moshe & Kliger, Doron & Vale, Bent, 2003. "Estimating switching costs: the case of banking," Journal of Financial Intermediation, Elsevier, vol. 12(1), pages 25-56, January.
  9. Pesaran, M. Hashem, 2004. "General Diagnostic Tests for Cross Section Dependence in Panels," IZA Discussion Papers 1240, Institute for the Study of Labor (IZA).
  10. 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.
  11. Steve Bond & Céline Nauges & Frank Windmeijer, 2005. "Unit roots: identification and testing in micro panels," CeMMAP working papers CWP07/05, Centre for Microdata Methods and Practice, Institute for Fiscal Studies.
  12. Im, Kyung So & Pesaran, M. Hashem & Shin, Yongcheol, 2003. "Testing for unit roots in heterogeneous panels," Journal of Econometrics, Elsevier, vol. 115(1), pages 53-74, July.
  13. Peter C.B. Phillips & Donggyu Sul, 2004. "Bias in Dynamic Panel Estimation with Fixed Effects, Incidental Trends and Cross Section Dependence," Yale School of Management Working Papers ysm428, Yale School of Management.
  14. 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.
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