The older and the modern way of viewing wealth.

1. Men seek to increase income by increasing capital. Men may strive to increase their rents without expressing the rent-bearer in terms of capital. Peasant owners and small proprietors, toiling fondly on their little estates, seeking steadily a larger crop, a larger income, accomplish wonders in bringing waste land to a high state of cultivation. Working on the soil that is at once their livelihood and their home, they do not consciously reckon the value of the labor they are putting upon it. No money can buy that which to them is beyond price. But, in our money economy, efforts are largely directed toward the increase of the capital sum. Investment takes the form of putting in a sum of money in the hope of getting an income bearing a certain relation to it. The first thought is of the value of the wealth invested, which has been carefully measured and expressed in dollars and cents. Wealth looked at in the older way was valued for what it did immediately for its owner, for its concrete fruits; looked at in the modern way, it is valued as a marketable income-bearer readily convertible into a multitude of other forms. Thus investments come to be thought of in terms of general purchasing power, from which it is expected to realize an income of a given percentage.

Free goods of unlimited supply.

2. There are some classes of goods that can be increased without any noticeable increase in difficulty. The extremest examples are undiminished goods such as air, sea-water, the water of large rivers. These are free goods because, however much is used, the supply is immediately renewed. But they are undiminished only in a relative sense and in reference to present need. The water in the Western rivers long flowed on, undiminished by the uses made of it. But progressing civilization required more water for cities, for mining, and for irrigation, and now states and corporations are going to law over these formerly undiminished free goods. Some kinds of goods are produced from such very common materials that it might seem possible, by the substitution of agents, to produce an unlimited supply. How can bricks be limited in number, being made as they are from one of the commonest materials on the earth's surface? But the largest clay banks are limited in size; a large proportion of the places where bricks are needed are not near a supply of clay of good quality; and after a brickyard has been used for a time there is increasing difficulty in getting out the material. While, therefore, bricks are scarce and hard to get from the outset in some places, the scarcity grows more marked in many places at first well supplied. If materials are scarce in any degree, their continued use for one purpose increases their scarcity in all other uses. Economic goods are goods having value; value implies scarcity, and an increasing demand means inevitably a higher value at some point. This is true of clay, stone, water, and the commonest kinds of labor.

Beginning of scarcity of common materials.

It has long been customary for economists to talk of economic goods that could be increased indefinitely (meaning infinitely or, in any event, without any limit ever appreciable to man) without any increase in the cost or scarcity. This class of goods was considered to be very large. There is no such class of economic goods; it is evidently impossible that there should be. If they are already "scarce," increasing demand must make them scarcer. There are, however, some goods that practically can be increased with so little difficulty that their limitation is not of great social importance. Progress, population, prosperity, are not primarily conditioned on their amount; limitation will be felt far earlier elsewhere. They are at one end of the scale; they are the relatively increasable goods.

No scarce goods can be indefinitely increased.

The products of land are increased at a given time and place at increasing cost.

3. There is a large class of goods whose increase is seen to be gained with increasing difficulty. This is seen most clearly in the diminishing returns from land. In the attempt to get some food-products in greater quantity from a given area at a given time, increasing difficulty is met with at once. This attempt continued for a series of years results in historical diminishing returns, as was strikingly illustrated in English experience during the Napoleonic wars, when wheat rose in value because of the greater difficulty of producing the larger supply needed. Some replenishing agents will restore themselves if given time; the forest will grow up if left untouched by man; the field will recover its fertile quality if allowed to lie fallow. But this self-replenishing of agents is a slow process, and time is costly. Man therefore tries in other ways to force more uses out of goods, until checked by the increasing difficulty.. The goods subject to "the law of increasing cost," as it was called formerly, were considered to be a peculiar class comprising only a small portion of wealth. But it can now be seen that the law may apply ultimately, though in differing degrees, to every kind of economic goods. Indeed, the principle just discussed is no more than one phase of the law of economic diminishing returns, which has a universal application to the realm of values.

Agents most nearly fixed in amount are somewhat increasable.

4. There is a class of goods, natural agents and stores of materials, which appears to be relatively fixed in quantity or which is increasable only with much difficulty. The first part of this proposition expresses mildly the thought that long obtained among economists: it was said that the supply of certain things was absolutely fixed, the chief of these being land used for agriculture. The idea as held by Malthus and Ricardo was modified by John Stuart Mill in somewhat inconsistent ways. Land, it was said, is a thing which "man cannot make," therefore its supply is fixed. The second part of the opening proposition expresses the view here held: the supply of no important class of goods is absolutely fixed, in any reasonable sense. Most, if not all, belong to the class that is increasable, although it may be with much difficulty. Even when the exact thing cannot be duplicated, as a bust by an ancient sculptor or an auto-graph of a dead author, many substitutes serving the same or closely related wants, affect and limit the demand, and thus increase the supply. Men cannot, it is true, increase the stores of copper in the earth, but they devise new processes to extract it from ores before worthless, and invent methods of procuring aluminium, which yields some of the same utilities as copper. Even the supply of land, as is shown elsewhere, is constantly changing. Thus all kinds of wealth can be increased in some degree; many kinds in the course of time are very greatly increased with little or no direct effort, but the supply of all alike can be secured in larger amount at any given moment only at the cost of increasing difficulty.