This law of price is just as valid for indirect as for direct exchange. The price of money, like other prices, is determined in the last resort by the subjective valuations of buyers and sellers. But, as has been said already, the subjective use-value of money, which coincides with its subjective exchange value, is nothing but the anticipated use-value of the things that are to be bought with it. The subjective value of money must be measured by the marginal utility of the goods for which the money can be exchanged.1
It follows that a valuation of money is possible only on the assumption that the money has a certain objective exchange value. Such a point d’appui is necessary before the gap between satisfaction and “useless” money can be bridged. Since there is no direct connection between money as such and any human want, individuals can obtain an idea of its utility and consequently of its value only by assuming a definite purchasing power. But it is easy to see that this supposition cannot be anything but an expression of the exchange ratio ruling at the time in the market between the money and commodities.2
Once an exchange ratio between money and commodities has been established in the market, it continues to exercise an influence beyond the period during which it is maintained; it provides the basis for the further valuation of money. Thus the past objective exchange value of money has a certain significance for its present and future valuation. The money prices of today are linked with those of yesterday and before, and with those of tomorrow and after.
But this alone will not suffice to explain the problem of the element of continuity in the value of money; it only postpones the explanation. To trace back the value that money has today to that which it had yesterday, the value that it had yesterday to that which it had the day before, and so on, is to raise the question of what determined the value of money in the first place. Consideration of the origin of the use of money and of the particular components of its value that depend on its monetary function suggests an obvious answer to this question. The first value of money was clearly the value which the goods used as money possessed (thanks to their suitability for satisfying human wants in other ways) at the moment when they were first used as common media of exchange. When individuals began to acquire objects, not for consumption, but to be used as media of exchange, they valued them according to the objective exchange value with which the market already credited them by reason of their “industrial” usefulness, and only as an additional consideration on account of the possibility of using them as media of exchange. The earliest value of money links up with the commodity value of the monetary material. But the value of money since then has been influenced not merely by the factors dependent on its “industrial” uses, which determine the value of the material of which the commodity money is made, but also by those which result from its use as money. Not only its supply and demand for industrial purposes, but also its supply and demand for use as a medium of exchange, have influenced the value of gold from that point of time onward when it was first used as money.3
2 The Necessity for a Value Independent of the Monetary Function Before an Object Can Serve as Money
If the objective exchange value of money must always be linked with a preexisting market exchange ratio between money and other economic goods (since otherwise individuals would not be in a position to estimate the value of the money), it follows that an object cannot be used as money unless, at the moment when its use as money begins, it already possesses an objective exchange value based on some other use. This provides both a refutation of those theories which derive the origin of money from a general agreement to impute fictitious value to things intrinsically valueless4 and a confirmation of Menger’s hypothesis concerning the origin of the use of money.
This link with a preexisting exchange value is necessary not only for commodity money, but equally for credit money and fiat money.5 No fiat money could ever come into existence if it did not satisfy this condition. Let us suppose that, among those ancient and modern kinds of money about which it may be doubtful whether they should be reckoned as credit money or fiat money, there have actually been representatives of pure fiat money. Such money must have come into existence in one of two ways. It may have come into existence because money substitutes already in circulation, that is, claims payable in money on demand, were deprived of their character as claims, and yet still used in commerce as media of exchange. In this case, the starting point for their valuation lay in the objective exchange value that they had at the moment when they were deprived of their character as claims. The other possible case is that in which coins that once circulated as commodity money are transformed into fiat money by cessation of free coinage (either because there was no further minting at all or because minting was continued only on behalf of the Treasury), no obligation of conversion being de jure or de facto assumed by anybody, and nobody having any grounds for hoping that such an obligation ever would be assumed by anybody. Here the starting point for the valuation lies in the objective exchange value of the coins at the time of the cessation of free coinage.
Before an economic good begins to function as money it must already possess exchange value based on some other cause than its monetary function. But money that already functions as such may remain valuable even when the original source of its exchange value has ceased to exist. Its value then is based entirely on its function as common medium of exchange.6
3 The Significance of Preexisting Prices in the Determination of Market Exchange Ratios
From what has just been said, the important conclusion follows that a historically continuous component is contained in the objective exchange value of money.
The past value of money is taken over by the present and transformed by it; the present value of money passes on into the future and is transformed in its turn. In this there is a contrast between the determination of the exchange value of money and that of the exchange value of other economic goods. All preexisting exchange ratios are quite irrelevant so far as the actual levels of the reciprocal exchange ratios of other economic goods are concerned. It is true that if we look beneath the concealing monetary veil to the real exchange ratios between goods we observe a certain continuity. Alterations in real prices occur slowly as a rule. But this stability of prices has its cause in the stability of the price determinants, not in the law of price determination itself. Prices change slowly because the subjective valuations of human beings change slowly. Human needs, and human opinions as to the suitability of goods for satisfying those needs, are no more liable to frequent and sudden changes than are the stocks of goods available for consumption, or the manner of their social distribution. The fact that today’s market price is seldom very different from yesterday’s is to be explained by the fact that the circumstances that determined yesterday’s price have not greatly changed overnight, so that today’s price is a resultant of nearly identical factors. If rapid and erratic variations in prices were usually encountered in the market, the conception of objective exchange value would not have attained the significance that it is actually accorded both by consumer and producer.
In this sense, reference to an inertia of prices is unobjectionable, although the errors of earlier economists should warn us of the real danger that the use of terms borrowed from mechanics may lead to a “mechanical” system, that is, to one that abstracts erroneously from the subjective valuations of individuals. But any suggestion of a causal relationship between past and present prices must be decisively rejected.
It is not disputed that there are institutional forces in operation which oppose changes in prices that would be necessitated by changes in valuations, and which are responsible when changes in prices that would have been caused by changes in supply and demand are postponed and when small or transitory changes in the relations between supply and demand lead to no corresponding change in prices at all. It is quite permissible to speak of an inertia of prices in this sense. Even the statement that the closing price forms the starting point for the transactions of the next market7 may be accepted if it is understood in the sense suggested above. If the general conditions that determined yesterday’s price have