Page:The Philadelphia Negro A Social Study.djvu/200

146 great city population is very difficult under ordinary circumstances, that here it is rendered more difficult and in some respects almost impossible by the fact that nineteen-twentieths of the population have in many cases refused to co-operate with the other twentieth, even when the co-operation means life to the latter and great advantage to the former. In other words, one of the great postulates of the science of economics—that men will seek their economic advantage—is in this case untrue, because in many cases men will not do this if it involves association, even in a casual and business way, with Negroes. And this fact must be taken account of in all judgments as to the Negro's economic progress.