### On a method of estimating the expenditure elasticity from concentration curves

L. Dancelli
In 1960 N.S. Iyengar developed a new method of estimating the expenditure elasticity of a specific item from two concentration curves the Lorenz curve of total expenditure (or income) and a generalized Lorenz curve which relates the proportion of consumption of the specific item to the proportion of consumers spending up to a given level of the total expenditure. On the assumptions of log normality of total expenditure distribution and of constancy of elasticity, the...