I present a survey on the econometric approach to the measurement of efficiency, focusing on the models used in empirical applications. I describe both models for cross sectional data and models for panel data. Finally, I survey the recent literature on models with time varying technical efficiency.

In this paper I provide an estimate of labor productivity growth for the electricity distribution sector in Latin America, in the period 1994 to 2001. I report an annual rate of labor productivity change of about 6%. A comparison of the changes in prices and labor productivity reveals that, in...