1. _The money use, historically considered, is a new use added to a good, and increases the demand for that good._ The history of any particular kind of money may be traced back to a point where it was not money, since which the money use has been added gradually to the other uses. The value of the material later to become money is determined, as is that of any good, according to its marginal utility in all possible applications. No new theory is required to explain the value of this same commodity as it gradually acquires the added use of a medium of exchange. The new use influences demand for the thing just as do the other uses. What is here said must be understood as applying to typical money, which is at the same time a commodity having other uses. Other things that are not typical money come later to be used as money, under legal regulations. [Sidenote: The other uses continue, slightly modified by the money use] 2. _A good that comes to be used as money continues to have a commodity use along with the money use._ When a thing is wanted for some quality that gives immediate gratification to the user, the explanation of its value is simple. Ornaments, shells, feathers, food can be seen to have a direct want-gratifying power. The money use is one that works no physical or visible change in goods, and to many minds it appears so different from other utilities that it remains quite mysterious and incomprehensible. To persons accustomed to thinking on problems of value, this case appears to be no more difficult than that of anything else having two or more uses. Cows are used for milk, for meat, and as beasts of burden. Each of these uses is logically independent as a cause of value, yet all are mutually related, the values of cattle being determined by the consideration of all their uses united into one scale of diminishing utility. [Sidenote: Money yields a series of rents which are the basis of its value]