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The quantity of industry which any capital can employ, must

evidently be equal to the number of workmen whom it can supply

with materials, tools, and a maintenance suitable to the nature

of the work. Money may be requisite for purchasing the materials

and tools of the work, as well as the maintenance of the workmen;

but the quantity of industry which the whole capital can employ,

is certainly not equal both to the money which purchases, and to

the materials, tools, and maintenance, which are purchased with

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

latter more properly than to the former.