ual product, while the value of the investment capital need be replaced only piecemeal, so that it requires complete replacement and therefore complete reproduction only in a period of, say, ten years (by a new material of the same kind). Consequently Adam Smith falls far below Quesnay.
So there is therefore absolutely nothing left to Adam Smith for a definition of fixed capital except that it is instruments of labour which do not change their shape in the process of production and continue to serve in production until they are worn out, as opposed to the products in the formation of which they assist. He forgets that all elements of productive capital continually confront in their bodily form (as instruments of labour, materials, and labour-power) the product and the product circulating as a commodity, and that the difference between the part consisting of materials and labour-power and that consisting of instruments of labour is only this: with regard to labour-power, that it is always purchased afresh (not bought for the time it lasts, as are the instruments of labour); with regard to the materials, that it is not the same identical materials that function in the labour-process throughout, but always new materials of the same kind. At the same time the false impression is created that the value of the fixed capital does not participate in the circulation, although of course Adam Smith previously explained the wear and tear of fixed capital as a part of the price of the product.
In opposing circulating capital to fixed, no emphasis is placed on the fact that this opposition exists solely because it is that constituent part of productive capital which must be wholly replaced out of the value of the product and must therefore fully share in its metamorphoses, while this is not so in the case of the fixed capital. Instead the circulating capital is jumbled together with those forms which capital assumes on passing from the sphere of production to that of circulation, as commodity-capital and money-capital. But both forms, commodity-capital as well as money-capital, are carriers of the value of both the fixed and the circulating component parts of productive capital. Both of them are capital of circulation, as distinguished from productive capital, but not circulating (fluent) capital as distinguished from fixed capital.
Finally, owing to the wholly erroneous explanation that profit is made by fixed capital staying in the process of production, and by circulating capital leaving it and being circulated, and also on account of the identity of form assumed in the turnover by the variable capital and the circulating constituent of the constant capital, their essential difference in the process of self-expansion and of the formation of surplus-value is hidden, so that the entire secret of capitalist production is obscured still more. The common designation "circulating capital" abolishes this essential difference. Political Economy subsequently went still farther by holding fast not to the antithesis between variable and constant capital but to the antithesis between fixed and circulating capital as the essential and sole delimitation.
After Adam Smith has designated fixed and circulating capital as two particular ways of investing capital, each of which yields a profit by itself, he says:
"No fixed capital can yield any revenue but by means of a circulating capital. The most useful machines and instruments of trade will produce nothing without the circulating capital which affords the materials they are employed upon, the maintenance of the workmen who employ them." (P. 188.)
Here it becomes apparent what the previously used expressions “yield a revenue,” “make a profit,” etc., signify, viz., that both parts of capital serve as creators of product.
Adam Smith then gives the following illustration:
“That part of the capital of the farmer which is employed in the instruments of agriculture is a fixed, that which is employed in the wages and maintenance of his labouring servants is a circulating capital.”
(Here the difference be