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Unobserved Heterogeneity and International Benchmarking in Public Transport


  • Massimo Filippini

    () (Center for Energy Policy and Economics CEPE, Department of Management, Technology and Economics, ETH Zurich, Switzerland)

  • Mehdi Farsi

    () (Center for Energy Policy and Economics CEPE, Department of Management, Technology and Economics, ETH Zurich, Switzerland)

  • Marie-Anne Plagnet

    (EDF, France)

  • Roxana Saplacan

    (EDF, France)


This paper analyzes the cost structure of the French electricity distribution sector prior to the re-structuring reforms that have been initiated in 2005 and gradually implemented in the form of re-grouping certain activities across distribution units. The aim of this study is to assess the empirical evidence in support of these re-structuring measures. We explore the cost structure of the distribution units operating in France over the three year period. The data include 279 observations from 93 distribution units from 2003 to 2005, operating within the French electricity distribution network namely, Electricité Réseau Distribution France (ERDF). A Cobb-Douglas cost function is estimated using several specifications focusing on the analysis of the economies of scale and customer density. In order to account for the unobserved heterogeneity and its impacts on the economies of scale, we use a latent class specification. The results suggest that a majority of the distribution units can exploit statistically significant economies of scale. Further, the empirical analysis indicates that the unexploited economies of scale can vary considerably from one unit to another, not only because of variations in outputs but also because of the unobserved differences in networks and technological characteristics. In particular, the latent class approach can identify a group of distribution units that do not show any significant economies of scale. Further analysis suggests that such distributors are often located in metropolitan areas with high customer density.

Suggested Citation

  • Massimo Filippini & Mehdi Farsi & Marie-Anne Plagnet & Roxana Saplacan, 2010. "Unobserved Heterogeneity and International Benchmarking in Public Transport," CEPE Working paper series 10-73, CEPE Center for Energy Policy and Economics, ETH Zurich.
  • Handle: RePEc:cee:wpcepe:10-73

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    Cited by:

    1. George Elias, 2016. "Benchmarking Heterogeneous Distribution System Operators: Evidence from Norway," Diskussionsschriften dp1606, Universitaet Bern, Departement Volkswirtschaft.

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    JEL classification:

    • D24 - Microeconomics - - Production and Organizations - - - Production; Cost; Capital; Capital, Total Factor, and Multifactor Productivity; Capacity
    • L43 - Industrial Organization - - Antitrust Issues and Policies - - - Legal Monopolies and Regulation or Deregulation
    • L92 - Industrial Organization - - Industry Studies: Transportation and Utilities - - - Railroads and Other Surface Transportation

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