Front Page Titles (by Subject) Other Metals. - Money and the Mechanism of Exchange
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Other Metals. - William Stanley Jevons, Money and the Mechanism of Exchange 
Money and the Mechanism of Exchange (New York: D. Appleton and Co. 1876).
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The metals yet mentioned are but a small number of those now known by chemists to exist, and it would be unwise to assume as certain that money must always be made in the future of the same materials as in the past. It is just conceivable, on the one hand, that in the course of time, some metal still more valuable than gold may be introduced. Roughly speaking, the order in which the metals have hitherto acted, as the principal medium of exchange, is (1) copper, (2) silver, (3) gold; as a general decline in the values of the metals took place, the more valuable replaced the less valuable, and the more portable gold is now rapidly taking the place of silver. Some still more valuable metal, such as the scarce and intractable iridium or osmium, or the remarkable metal palladium, might possibly take the place of gold. This, however, is barely more than a matter of scientific fancy.
On the other hand, many metals exist which might be produced more cheaply than silver, such as aluminium or manganese. It may be well worthy of inquiry whether in such metals may not be found the best solution of the fractional currency difficulty, to be afterwards more fully discussed (p. 132).