This paper compares cost efficiencies of Brazilian public and private companies of water supply. To measure efficiency a Cobb-Douglas stochastic cost frontier model including technical effects is estimated by maximum likelihood to a panel of Brazilian firms for the period 2002-2004. The...

This paper assesses cost efficiencies of Brazilian public and private companies of water supply. To measure the efficiency, we used a stochastic frontier model derived from the translog family – a specification similar to a Cobb-Douglas including a quadratic term in log output. The model...

The objective of this study is to evaluate the technical efficiency of Brazilian companies that operate in the international market of animal protein (beef, pork and poultry). The six business groups of interest are JBS – Friboi, BRF – Brasil Foods, Marfrig, Minerva, Minupar and Excelsior....

In this article we perform production efficiency analysis for the 40 countries with largest value added by agricultural sector in 2005. Under the assumption of a nonparametric frontier and production observations satisfying a statistical model including both random and inefficiency errors, we...