Labor and the Obtaining of its Product, in Static Industry, Synchronous.—One function of the permanent series of A's is to enable labor everywhere to get its virtual product without waiting, and that too in the form in which it needs it for use. The labor that converts A´´ into A´´´ supplies the waste of tissue that takes place at that end of the line by withdrawal of an A´´´. The labor that turns into A´´ replaces the waste that takes place at that point when an earlier A´´ becomes an A´´´. The labor at replaces the waste at that point, and that at A replaces the waste at still another point. They are all at work keeping the stock of A's unimpaired, and one of them does as much toward keeping up the perpetual flow of A´´´'s as any other.

If we pump water in at one end of a full reservoir, we instantly cause it to overflow at the other end; and every worker in such a series as we have described may be thought of as putting something into the permanent reservoir of capital and so causing a corresponding overflow. He gets his reward day by day as the work proceeds. Wherever a laborer may be in such a series, his work creates a ripened product as it goes on. He has not to wait for it. His work and its fruit are synchronous.

Differences between Land and Made Instruments Apparent in Dynamic Conditions.—A point that has great theoretical interest is the nature of the difference between land and other productive instruments. In a static society the difference would be comparatively unimportant, but it is brought into prominence by the changes which constitute a dynamic state. The static hypothesis requires that capital should not increase or diminish in quantity, and that it should not change its forms. The equipment of every mill and of every ship is kept unimpaired but not enlarged or improved. There is a fixed number of spindles in the cotton mill, of lathes in the machine shop, of sewing machines in the shoe factory, etc., and this fact removes the most striking difference which, in a dynamic society, actually distinguishes land from other things.

Land, in the economic sense, does not increase in quantity, however changeful and progressive a society may be. The chief distinguishing mark of land—that of being fixed in amount—separates it from other things only in a dynamic state and because of the action of the forces which produce organic changes. These are subjects to be studied in the dynamic division of economic theory.

A Distinguishing Mark of Land which appears in a Static State of Industry.—In a static state there remains this difference between a piece of ground and a building, a tool, or any other instrument: the ground is not artificially made and does not perish in the using; while the building or the tool or other appliance is so made and does so perish. It must in wearing itself out create in the indirect way which we have described its own successor. The engine must, by a part of its product, pay the men who will make another engine and so perpetuate the series of engines. This makes it necessary for the owner of the engine to save some of its gross rent to pay for depreciation and renewal, while he can safely use the whole rent of land.

This Mark of Distinction not Applicable when Land is contrasted with a Permanent Stock of Capital Goods.—If we look, not at one particular instrument, but at an entire series of them,—if we take into view, not only the engine which is now driving the mill, but also the one that will succeed it, and again the one which will succeed that second engine, and so on forever,—this difference between land and the artificial instrumentality vanishes. The series of engines, like land itself, yields only a net rent. The remainder of its gross product is not a true rent at all, since any one of the engines creating it has to consume it on itself and cannot give it to the owner as an income. This remainder pays certain men for keeping the series of engines intact, and what is given to them as pay for their services cannot accrue to any one as an income from the series of instruments so maintained. It is the earnings of the corps of maintenance created by their own labor and capital. What the series of engines yields over and above what it expends in maintaining itself it gives to its owners as an income. This is their net return and they can use it without trenching on their property. The analogy between the returns from land and those from a self-perpetuating series of made capital goods is in this particular complete.

The Source of the Fund for Repairs and Renewals.—The fund for repairs and renewals must, of course, like the net income itself, be furnished by instruments that are above the no-rent grade. A machine will naturally be used as long as it pays anything whatever, and during the latter part of its career it usually produces less than mere interest on its cost. So long as the labor and the auxiliary capital that are combined with the instrument produce by its aid any more than they would produce if they were withdrawn from it and added, as marginal increments, to the labor and capital that are working in connection with good instruments, they will continue to use the machine and they will abandon it only when it ceases to pay anything whatever. Out of the total amount it produces before reaching this point of abandonment comes the amount that is needed as an offset for the cost of providing a new machine.

Incorrectness of a Common Statement concerning Rent and Price.—This brings into view a striking fallacy of what has been current economic theory. It has been customary to claim that the rent of land "is not an element in price," although the interest on capital is such an element. The rent of land is the net product of land; and if interest be kept distinct from it, this income is the net product of a permanent stock of capital goods. The relations of these two component parts of the constant output of goods to the prices of the goods are identical.

Proof of the Incorrectness of the Current Statement concerning Rent and Price.—The vague form of the current statement concerning rent and price is responsible for much confusion of thought on that subject. What the statement would mean is that the price of wheat is not affected by the great contributions to the supply of it which good lands are making. These contributions are the rent in its original form. The rent of wheat land is wheat, that of cotton land is cotton, that of mill sites is manufactured goods, etc. That money is used in payments made to landlords changes nothing that is essential. To say that such contributions to the supply of particular commodities are not an element in determining the prices of them, would be as unreasonable as to make the same assertion concerning other parts of the supply. Quite as logically might it be asserted that other components in the supply do not affect prices—that the amount of wheat which is attributable to harvesting machinery or the amount of calico which is imputable to looms has no influence in the market values of these articles.

Why the Produce due to Good Land prevents Prices from greatly Rising.—If the use of good wheat land were merely discontinued, the supply of wheat would of course be not only lessened, but reduced almost to nothing, and a famine price would at once result. If, now, an attempt were made to make good the shortage of the supply of this cereal by tilling lands which are now at the margin of cultivation, it would at once appear that not enough of such land exists to enable us to accomplish the purpose, and it would be necessary to push the margin outward and till poorer and poorer soils, at a greatly enlarging cost. We should grub out worse thickets, drain worse swamps, terrace more discouraging hillsides, irrigate more remote and barren deserts, etc. All this would mean a greater cost of production of wheat and a higher price for it in the market.