Villarroya, Joaquín Maudos - Instituto Valenciano de Investigaciones Económicas (IVIE) - 1996
. Three different stochastic measures of efficiency are used (based on three alternative distributional assumptions for …" hypothesis since, even though efficiency is the main determinant of profitability, market power (as reflected in a market share … variable), also affects profitability. The results obtained also show that market share is an inadequate proxy for efficiency …