In this paper we generalize the concept of scale elasticity to accommodate changes in any direction in the input–output space and not only in the radial input and output directions as was done so far with the conventional scale elasticity measure. Our departure point is that we view the scale...

This paper extends recently developed parametric hyperbolic distance functions to the analysis of energy and environmental efficiency for a panel data of 29 provinces in China from 1995–2010, and then decomposes the growth of environmental total factor productivity into two component measures,...