§ 6. What is essential to the idea of Money?

There has been a great amount of discussion and argument on the question whether several of these forms of credit, and in particular whether bank-notes, ought to be considered as money. It seems to be an essential part of the idea of money that it be legal tender. An inconvertible paper which is legal tender is universally admitted to be money; in the French language the phrase papier-monnaie actually means inconvertibility, convertible notes being merely billets à porteur. An instrument which would be deprived of all value by the insolvency of a corporation can not be money in any sense in which money is opposed to credit. It either is not money, or it is money and credit too.

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It would seem, from all study of the essentials of money (Book III, Chapter IV), that the necessary part of the idea of money is that it should have value in itself. No one parts with valuable commodities for a medium of exchange which does not possess value; and we have seen that Legislatures can not control the natural value of even the precious metals by giving them legal-tender power. Much less could it be done for paper money. Paper, therefore, may, as an instrument of credit, be a substitute for money; but, in accordance with the above test, it can not properly be considered as money in the full sense. Of course, paper money, checks, etc., perform some of the functions of money equally well with the precious metals. F. A. Walker holds that anything is money which performs money-work; but he excludes checks from his catalogue of things which may serve as money. It is practically of little importance, however, what we include under money, so long as its functions are well understood; it is merely a question of nomenclature, and need not disturb us.

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