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When, by any particular sum of money, we mean not only to express

the amount of the metal pieces of which it is composed, but to

include in its signification some obscure reference to the goods

which can be had in exchange for them, the wealth or revenue

which it in this case denotes, is equal only to one of the two

values which are thus intimated somewhat ambiguously by the same

word, and to the latter more properly than to the former, to the

money's worth more properly than to the money.