In this paper a two-stage Data Envelopment Approach is used to assess the relative efficiency of container shipping agents operating at Spanish ports, and studying the factors influencing it. In the first stage, an input-oriented, Variable Returns to Scale (VRS) model is used to compute efficiency scores of the different shipping agents. The model considers labor as input, and numbers of loaded…
The purpose of this paper is to analyze the existence of differences in the implementation of environmental practices between companies that possess some form of certified environmental management system (ISO 14001 or EMS) and those that do not have any such system. This study also investigates whether companies with a certified EMS are also making additional environmental demands on their supp…