A rank three demand system incorporating labour force participation, non-separability of demands from excluded goods and non-exeact aggregation in income and household characteristics is estimated using United States Consumer Expenditue Survey microdata.

In this paper I propose a method for calculating a wide class of inequality indices from parametric approximations of Lorenz curves. This method uses a general approximation first introduced in Rongve and Beach (1997) and is advantageous over previous methods because it is easily calculated,...