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218 knowledge is a virtue which Spencer sometimes exaggerates into a vice, and a vice which some of his disciples too seldom reduce to the proportions of a virtue.

To the economic truism I will give a little more attention, its irrelevancy being less apparent. Here it is: "The existence of interest depends, of course, primarily upon the existence of private property." I call this a truism, though the word "primarily" introduces an element of error. If we are to inquire upon what interest primarily depends, we shall start upon an endless journey into the realm of metaphysics. But without entering that realm we certainly can go farther back in the series than private property and find that interest depends still more remotely upon the existence of human beings and even of the universe itself. However, interest undoubtedly depends upon private property, and, if this fact had any significance, I should not stop to trifle over the word "primarily." But it has no significance. It only seems to have significance because it carries, or seems to be supposed to carry, the implication that, if private property is a necessary condition of interest, interest is a necessary result of private property. The inference, of course, is wholly unwarranted by logic, but that it is intended appears from a remark almost immediately following: "Expectations have been entertained that it [interest] will eventually become zero; but this stage will probably be reached only when economic products become common free property of the human race." The word "probably" leaves the writer, to be sure, a small logical loophole of escape, but it is not expected that the reader will notice it, the emphasis being all in the other direction. The reader is expected to look upon interest as a necessary result of private property simply because without private property there could be no interest. Now, my hat sometimes hangs upon a hook, and, if there were no hook, there could be no hanging hat; but it by no means follows that because there is a hook there must be a hanging hat. Therefore, if I wanted to abolish hanging hats, it would be idle, irrelevant, and illogical to declare that I must first abolish hooks. Likewise it is idle, irrelevant, and illogical to declare that before interest can be abolished private property must be abolished. Take another illustration. If there were no winter, water-pipes would never freeze up, but it is not necessary to abolish winter to prevent this freezing. Human device has succeeded in preventing it as a general thing. Similarly, without private property there would be no borrowing of capital and therefore no interest; but it is claimed that, without abolishing private property, a