We study how the presence of middle class in sense Gevorgyan-Malykhin affects value income inequality measures including Gini coefficient J and Hoover index H. It is proved that (1) $J \leqslant \frac{1}{2}\frac{{L'\left( 0 \right)}}{2}$ (where L Lorenz function), (2) $H \frac{1}{2}$, (3) longest vertical distance between diagonal curve (which equal to H) attained at ${z_0} < \frac{3}{4}$ A ...

the purpose of this study was to investigate the possible affect of socio-economic class on the degree of acceptability and consumption of milk in children. this study was conducted on 9204 children who were chosen from two different socio-economic classes: high (groul1 1) and low (group. 2) in tehran. samples were aged betweea1 five to eighteen years, and divided into six age categories. the r...