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


  • Giannetti, C.

    (Tilburg University, Center For Economic Research)


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.

Suggested Citation

  • Giannetti, C., 2008. "Unit Roots and the Dynamics of Market Shares : An Analysis Using Italian Banking Micro-Panel," Discussion Paper 2008-44, Tilburg University, Center for Economic Research.
  • Handle: RePEc:tiu:tiucen:08ff44cb-31c2-4845-8f7d-106a7da06aa6

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    References listed on IDEAS

    1. Hugo Kruiniger & Elias Tzavalis, 2002. "Testing for unit roots in short dynamic panels with serially correlated and heteroskedastic disturbance terms," 10th International Conference on Panel Data, Berlin, July 5-6, 2002 B5-1, International Conferences on Panel Data.
    2. Edith Madsen, 2003. "Unit root inference in panel data models where the time-series dimension is fixed: A comparison of different tests," CAM Working Papers 2003-13, University of Copenhagen. Department of Economics. Centre for Applied Microeconometrics.
    3. Arellano, Manuel, 2003. "Panel Data Econometrics," OUP Catalogue, Oxford University Press, number 9780199245291.
    4. 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.
    5. Levin, Andrew & Lin, Chien-Fu & James Chu, Chia-Shang, 2002. "Unit root tests in panel data: asymptotic and finite-sample properties," Journal of Econometrics, Elsevier, vol. 108(1), pages 1-24, May.
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    Cited by:

    1. Jacques Bughin, 2015. "Google searches and twitter mood: nowcasting telecom sales performance," Netnomics, Springer, vol. 16(1), pages 87-105, August.

    More about this item


    Turbulence; cross-section dependence;

    JEL classification:

    • C23 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Models with Panel Data; Spatio-temporal Models
    • D40 - Microeconomics - - Market Structure, Pricing, and Design - - - General


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