That is to say, opportunities for exchanging induce the individual to rearrange his scales of values. A person in whose scale of values the commodity “a cask of wine” comes after the commodity “a sack of oats” will reverse their order if he can exchange a cask of wine in the market for a commodity that he values more highly than a sack of oats. The position of commodities in the value scales of individuals is no longer determined solely by their own subjective use-value, but also by the subjective use-value of the commodities that can be obtained in exchange for them, whenever the latter stand higher than the former in the estimation of the individual. Therefore, if he is to obtain the maximum utility from his resources, the individual must familiarize himself with all the prices in the market.
For this, however, he needs some help in finding his way among the confusing multiplicity of the exchange ratios. Money, the common medium of exchange, which can be exchanged for every commodity and with which every commodity can be procured, is preeminently suitable for this. It would be absolutely impossible for the individual, even if he were a complete expert in commercial matters, to follow every change of market conditions and make the corresponding alterations in his scale of use-values and exchange values, unless he chose some common denominator to which he could reduce each exchange ratio. Because the market enables any commodity to be turned into money and money into any commodity, objective exchange value is expressed in terms of money. Thus money becomes a price index, in Menger’s phrase. The whole structure of the calculations of the entrepreneur and the consumer rests on the process of valuing commodities in money. Money has thus become an aid that the human mind is no longer able to dispense with in making economic calculations.9 If in this sense we wish to attribute to money the function of being a measure of prices, there is no reason why we should not do so. Nevertheless, it is better to avoid the use of a term which might so easily be misunderstood as this. In any case the usage certainly cannot be called correct—we do not usually describe the determination of latitude and longitude as a “function” of the stars.10
When an indirect exchange is transacted with the aid of money, it is not necessary for the money to change hands physically; a perfectly secure claim to an equivalent sum, payable on demand, may be transferred instead of the actual coins. In this by itself there is nothing remarkable or peculiar to money. What is peculiar, and only to be explained by reference to the special characteristics of money; is the extraordinary frequency of this way of completing monetary transactions.
In the first place, money is especially well adapted to constitute the substance of a generic obligation. Whereas the fungibility of nearly all other economic goods is more or less circumscribed and is often only a fiction based on an artificial commercial terminology, that of money is almost unlimited. Only that of shares and bonds can be compared with it. The sole factor that could possibly prevent any of these from being completely fungible is the difficulty of sub-dividing their separate units; and various expedients have been adopted, which, at least as far as money is concerned, have entirely robbed this difficulty of all practical significance.
A still more important circumstance is involved in the nature of the function that money performs. A claim to money may be transferred over and over again in an indefinite number of indirect exchanges without the person by whom it is payable ever being called upon to settle it. This is obviously not true as far as other economic goods are concerned, for these are always destined for ultimate consumption.
The special suitability for facilitating indirect exchanges possessed by absolutely secure and immediately payable claims to money, which we may briefly refer to as money substitutes, is further increased by their standing in law and commerce.
Technically, and in some countries legally as well, the transfer of a banknote scarcely differs from that of a coin. The similarity of outward appearance is such that those who are engaged in commercial dealings are usually unable to distinguish between those objects that actually perform the function of money and those that are merely employed as substitutes for them. The businessman does not worry about the economic problems involved in this; he is only concerned with the commercial and legal characteristics of coins, notes, checks, and the like. To him, the facts that banknotes are transferable without documentary evidence, that they circulate like coins in round denominations, that no fight of recovery lies against their previous holders, that the law recognizes no difference between them and money as an instrument of debt settlement, seem good enough reason for including them within the definition of the term money, and for drawing a fundamental distinction between them and cash deposits, which can be transferred only by a procedure that is much more complex technically and is also regarded in law as of a different kind. This is the origin of the popular conception of money by which everyday life is governed. No doubt it serves the purposes of the bank official, and it may even be quite useful in the business world at large, but its introduction into the scientific terminology of economics is most undesirable.
The controversy about the concept of money is not exactly one of the most satisfactory chapters in the history of our science. It is chiefly remarkable for the smother of juristic and commercial technicalities in which it is enveloped and for the quite undeserved significance that has been attached to what is after all merely a question of terminology. The solution of the question has been regarded as an end in itself and it seems to have been completely forgotten that the real aim should have been simply to facilitate further investigation. Such a discussion could not fail to be fruitless.
In attempting to draw a line of division between money and those objects that outwardly resemble it, we only need to bear in mind the goal of our investigation. The present discussion aims at tracing the laws that determine the exchange ratio between money and other economic goods. This and nothing else is the task of the economic theory of money. Now our terminology must be suited to our problem. If a particular group of objects is to be singled out from among all those that fulfill a monetary function in commerce and, under the special name of money (which is to be reserved to this group alone), sharply contrasted with the rest (to which this name is denied), then this distinction must be made in a way that will facilitate the further progress of the investigation.
It is considerations such as these that have led the present writer to give the name of money substitutes and not that of money to those objects that are employed like money in commerce but consist in perfectly secure and immediately convertible claims to money.
Claims are not goods;1 they are means of obtaining disposal over goods. This determines their whole nature and economic significance. They themselves are not valued directly, but indirectly; their value is derived from that of the economic goods to which they refer. Two elements are involved in the valuation of a claim: first, the value of the goods to whose possession it gives a right; and, second, the greater or less probability that possession of the goods in question will actually be obtained. Furthermore, if the claim is to come into force only after a period of time, then consideration of this circumstance will constitute a third factor in its valuation. The value on January 1 of a right to receive ten sacks of coal on December 31 of the same year will be based not directly on the value of ten sacks of coal, but on the value of ten sacks of coal to be delivered in a year’s time. This sort of calculation is a matter of common experience, as also is the fact that in reckoning the value of claims their soundness or security is taken into account.
Claims to money are, of course, no exception. Those which are payable on demand, if there is no doubt about their soundness and no expense connected with their settlement, are valued just as highly as cash and tendered and accepted