When comparing economic well-being using income or expenditures, an equivalence scale is often used to adjust for differences in characteristics that affect needs. For example, a family of two is assumed to need more income than a single person, but not twice as much due to the economies of...

The paper discusses the U-shaped relationship between the equivalence scale ne and the Gini index instead of considering the equivalence scale's relationship to the generalised entropy measures, which was studied by Coulter, et al. (1992). An end-point condition is given for the U-shaped...