There are some exceptions, however, such as the highest quintile in Colombia and Guatemala, where the increase in transfers and other incomes easily outpaced labour-income growth, or the widespread fall in income in Uruguay, in which all sources participated to the same extent. For that reason, it is best to use them in a complementary way (see box 1.8). This chapter uses four of the best-known, which are described in detail below. It corresponds to the area between the Lorenz curve and the equi-distribution line.