What do we mean by the Doctrine of the Materialistic Conception of History, or of "Economic Determinism," as Ferri calls it? We must make sure we understand, for there is cant in Socialism, just as there is in religion, and there is good reason to fear many of us go on using these good mouth-filling phrases, "Materialistic Conception of History," "Class-Conscious Proletariat," "Class Struggle," and "Revolutionary Socialism," with no more accurate idea of their meaning than our pious friends have of the theological phrases they keep repeating like so many poll-parrots. At bottom, when we talk intelligently of the Materialistic Conception of History, we simply mean, what every man by his daily conduct proves to be true, that the bread and butter question is the most important question in life. All the rest of the life of the individual is affected, yes dominated the way he earns his bread and butter. As this is true of individuals, so also it is true of societies, and this gives us the only key by which we can understand the history of the past, and, within limits, predict the course of future development. That is all there is of it. That is easy to understand, and every man of common sense is bound to admit that that much is true. The word "materialistic" suggests philosophy and metaphysics and brings to our minds the old disputes about monism and dualism, and the dispute between religious people who believe in the existence of spirit and scientists who adopt modern materialistic monism. But no matter what position a man may hold on these philosophical and theological questions he can with perfect consistency recognize the fact that the economic factor is the dominant, determining factor in every day human life, and the man who admits this simple truth believes in the Marxian Materialistic Conception of History. The political, legal, ethical and all human institutions have their roots in the economic soil, and any reform that does not go clear to the roots and affect the economic structure of society must necessarily be abortive. Any thing that does go to the roots and does modify the economic structure, the bread and butter side of life, will inevitably modify every other branch and department of human life, political, ethical, legal, religious, etc. This makes the social question an economic question, and all our thought and effort should be concentrated on the economic question.[2]