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Thus, if a guinea be the weekly pension of a particular person,

he can in the course of the week purchase with it a certain

quantity of subsistence, conveniencies, and amusements. In

proportion as this quantity is great or small, so are his real

riches, his real weekly revenue. His weekly revenue is certainly

not equal both to the guinea and to what can be purchased with

it, but only to one or other of those two equal values, and to

the latter more properly than to the former, to the guinea's

worth rather than to the guinea.