CURRENT attention to our urban crisis has greatly intensified an already existing interest in data on income distribution for individual cities. The data are significant for a great variety of purposes- estimates of demand for various products, for housing at various prices or rentals, and for many municipal services including welfare, medicaid, hospital and clinic services. Furthermore, the data are the best general indicators available of the economic progress the city’s inhabitants are making and of how various groups in the city are sharing in this progress.