In this paper, we question the definition of a financial technology that results from the application of a traditional methodology with DEA to the analysis of portfolios of financial assets. We acknowledge the previous applications and show how two approaches have been adopted until now in the...

This note generalizes analytical relationships among activity variables of DEA models previously derived by Boussemart, Briec and Leleu (2007). We relax the asumption of constant returns to scale by showing that the key results hold under a weaker asumption of homogeneity. We use the notion of...