_The currency._—The last essential in perfect freedom of exchange is a satisfactory means of transferring completely and quickly all property right in any article of trade. Exchange of commodity for commodity or service for service is possible to a very limited extent, since the man who wants my horse may have nothing which I want in return, or if he has, the values may be unequal, and one or the other must remain in debt, which means that one of the articles belongs in part to both. In some new countries exchanges are confined to this slow and uncertain method of barter, where nobody can buy until he finds a neighbor wanting just what he himself has to sell. Traders in such countries contrive to accumulate a variety of things needed by all sorts of people, that they may be ready with some kind of exchange to meet particular wants. No community, however, begins to reap the clear advantages of exchange until some universally acceptable medium of exchange is discovered and accepted. The process of developing this medium is essentially the same as that described in establishing a standard of value; and so the word money naturally represents both the standard of value and the common currency of trade. It is easy, however, to see by further examination that the two functions of money are quite easily separable, and that, while it is difficult to substitute for the standard of value, a variety of substitutes can serve as currency. In speaking of coinage hitherto, the standard of value has been assumed to be the most important, but in fact a large proportion of our coin serves simply as currency without materially affecting the standard of value. This is true of all the fractional coins, which are purposely over-valued, and equally true of the silver dollar under existing circumstances. In fact, the primary use of coin was simply for the purpose of transferring property. In the words of Aristotle, 350 B. C., “Men invented among themselves, by way of exchange, something which they should mutually give and take, and which, being really valuable in itself, might easily be passed from hand to hand for purposes of daily life.” This coined money supplies the needed means of exchange most readily because it carries its value with it. In all civilized communities, and in many only partially civilized, it is readily exchangeable for any article of commerce. It is also valued in proportion to its weight, so that any bulk in gold or in silver may be easily divided by exchange for smaller coins. With a little painstaking the coins are made identical in value, so that every trader knows what he gives and receives. They are exceedingly durable, resisting almost all the forces of nature with little loss. For this reason they are likely to have an almost universal value, that is to be wanted by everybody, in any place, at any time, and under any circumstances. These facts are proved by the tendency to hoard such coins whenever individuals