We must also remember that a large social group, as such, may be relatively wealthy and even enjoy a high degree of total welfare and still have among its members many who suffer from a lack of the common necessaries of fife. This situation we often meet in large cities, where alongside lavish displays of wealth we find multitudes of undernourished creatures dragging out a miserable existence in dirty, crowded tenement houses. On the one extreme is abundance; on the other, poverty and want. This inequality offers the hardest social problem we are called on to solve. It engages the attention of serious thinking people everywhere, for it seems to contradict the prevalent notion that progress in the industrial arts has been accompanied by an increase in the welfare of all classes of society.