Abstract (EN):
Regulators of electricity distribution networks have typically applied Data Envelopment Analysis
(DEA) to cross-section data for benchmarking purposes. However, the use of panel data to analyse
the impact of regulatory policies on productivity change over time is less frequent. The main purpose of
this paper is to construct a Malmquist productivity index to examine the recent productivity change
experienced by Norwegian distribution companies between 2004 and 2007. The Malmquist index is
decomposed in order to explore the sources of productivity change, and to identify the innovator
companies that pushed the frontier forward each year. The input and output variables considered
are those used by the Norwegian regulator. In order to reflect appropriately the exogenous conditions
where the companies operate, the efficiency model used in this paper incorporates geography variables
as outputs of the DEA model. Unlike the model used by the regulator, we included virtual weight
restrictions in the DEA formulation to correct the biases in the DEA results that may be associated to
a judicious choice of weights by some of the companies.
Idioma:
Inglês
Tipo (Avaliação Docente):
Científica