The economic causes of any political movement or system are related to certain fundamental needs or wants of man's nature and upon the measure in which that system claims to be, and is actually, able to fulfil those wants. In the purely physical sphere these requirements of our nature are easy enough to define. But nhen we come to consider the mental and spiritual requirements of man's nature we must at the outset make a distinction between what a man needs and what he wants, far there is great diversity here. It is true that in different ages different needs and wants will predominate, and that in one century the emphasis will be laid where afterwards it is bur lightly stressed. Yet because the human body has within historical memory developed far less rhan the human mind we may say thar essential wants of the human body are constant. The want of food, for instance or the want of warmth for the body. Without these wants being satisfied the body could not survive. Now it is especially to these wants—to the complex of living conditions—that I refer when I say that the economic causes of any political system are related to certain wants of man's nature.