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When we compute the quantity of industry which the circulating

capital of any society can employ, we must always have regard to

those parts of it only which consist in provisions, materials,

and finished work; the other, which consists in money, and which

serves only to circulate those three, must always be deducted. In

order to put industry into motion, three things are requisite;

materials to work upon, tools to work with, and the wages or

recompence for the sake of which the work is done. Money is

neither a material to work upon, nor a tool to work with; and

though the wages of the workman are commonly paid to him in

money, his real revenue, like that of all other men, consists,

not in the money, but in the money's worth; not in the metal

pieces, but in what can be got for them.