_Why Abstract Terms are used in popularly describing Capital._--In certain connections money is, in unintelligent thinking, confused with real capital in ways that we should guard against. In avoiding such errors we need to be even more careful that we do not miss the truth that is at the basis of the common mode of describing capital. A permanent fund that is spoken of as a million dollars invested in a business does not suggest to any one a literal pile of a million silver or paper dollars or of a hundred thousand gold eagles. It suggests what is actually in the business, a procession of things each of which comes into the man's possession and then leaves him, and helps him to keep the constant stock of goods that at any time is a potential million of dollars. A permanent body of any kind, if it is made up of shifting tissues, is commonly described by the use of an abstract term. A waterfall, made as it is of rapidly changing drops of water, is spoken of as a "water power," since the power is the abiding thing. An endless series of living human beings is described as "humanity," since that remains through all personal changes. An endless series of workingmen is described as "labor," and we study the "wages of labor," the "relations of labor to capital," etc., because these are permanent relations. Men come and go, but labor continues and is the source of a permanent income. It is actually the fact that in speaking of the "labor problem" or the "relation of capital and labor" we usually think of "labor in the abstract," as we might term it; but this is very far from implying that we consider a series of generations of actual workingmen as an abstraction. We may, using terms in a like way, speak of the problem of interest as concerning "capital in the abstract"; but this is far from meaning that we consider an endless series of material instruments of industry an abstraction. We describe these real things by the use of an abstract term, just as we describe a thousand other realities. A "fund," a "value," a "permanent quantum of wealth," is capital; but with the abstract notion the mind always merges the thought of the concrete entity. It is the tools of industry that, in their endless march, come into and go out of the industrial field that we think of even when we use the abstract term. This term, however, saves us from the danger of thinking merely of particular tools that we can identify and trace to their final destruction when we form the concept of capital.