We have seen that, in relation to the products toward the creation of which it contributes, a portion of the constant capital retains that definite use-form in which it enters into the process of production. Hence it performs the same functions for a longer or shorter period, in ever repeated labour-processes. This applies for instance to industrial buildings, machinery, etc. — in short to all things which we comprise under the name of instruments of labour. This part of constant capital yields up value to the product in proportion as it loses its own exchange-value together with its own use-value. This delivery of value, or this transition of the value of such a means of production to the product which it helps to create is determined by a calculation of averages. It is measured by the average duration of its function, from the moment that the means of production enters into the process of production to the moment that it is completely spent, dead and gone, and must be replaced by a new sample of the same kind, or reproduced.
This, then, is the peculiarity of this part of constant capital, of the labour instruments proper:
A part of capital has been advanced in the form of constant capital, i.e., of means of production, which function as factors of the labour-process so long as they retain the independent use-form in which they enter this process. The finished product, and therefore also the creators of the product, so far as they have been transformed into product, is thrust out of the process of production and passes as a commodity from the sphere of production to the sphere of circulation. But the instruments of labour never leave the sphere of production, once they have entered it. Their function holds them there. A portion of the advanced capital-value becomes fixed in this form determined by the function of the instruments of labour in the process. In the performance of this function, and thus by the wear and tear of the instruments of labour, a part of their value passes on to the product, while the other remains fixed in the instruments of labour and thus in the process of production. The value fixed in this way decreases steadily, until the instrument of labour is worn out, its value having been distributed during a shorter or longer period over a mass of products originating from a series of constantly repeated labour-processes.
This portion of the capital-value fixed in the instrument of labour circulates as well as any other. During the entire period of its functioning, a part of its value always remain fixed in it, independently of the commodities which it helps to produce. It is this peculiarity which gives to this portion of constant capital the form of fixed capital. All the other material parts of capital advanced in the process of production form by way of contrast the circulating, or fluid, capital.
Some means of production do not enter materially into the product.Such are auxiliary materials, which are consumed by the instruments of labour themselves in the performance of their functions, like coal consumed by a steam-engine; or which merely assist in the operation, like gas for lighting, etc. It is only their value which forms a part of the value of the products. The product circulates in its own circulation the value of these means of production. This feature they have in common with fixed capital. But they are entirely consumed in every labour-process which they enter and must therefore be wholly replaced by new means of production of the same kind in every new labour-process. They do not preserve their independent use-form while performing their function. Hence while they function no portion of capital-value remains fixed in their old use-form, their bodily form, either.
That part of the means of production which bodily enters into the product, i.e., raw materials, etc., thus assumes in part forms which enable it later to enter into individual consumption as articles of use. The instruments of labour properly so called, the material vehicles of the fixed capital, are consumed only productively and cannot enter into individual consumption, because they do not enter into the product, or the use-value, which they held to create but retain their independent form with reference to it until they are completely worn out.
As for the variable component of productive capital, which is invested in labour-power, be it noted that labour-power is purchased for a definite period of time. As soon as the capitalist has bought it and embodied it in the process of production, it forms a component part of his capital, its variable component. Labour-power acts daily during the period of time in which it adds to the product not only its own value for the whole day but also a surplus-value in excess of it. We shall not consider this surplus-value for the present. After labour-power has been bought and it has performed its function, say for a week, its purchase must be constantly renewed within the customary intervals of time. The equivalent of its value, which the labour-power adds to the product during its functioning and which is transformed into money in consequence of the circulation of the product, must continually be reconverted from money into labour-power or continually pass through the complete circuit of its forms, that is, must be turned over, if the circuit of continuous production is not to be interrupted.
Hence that part of the value of the productive capital which has been advanced for labour-power is entirely transferred to the product (we constantly leave the question of surplus-value out of consideration here), passes with it through the two metamorphoses belonging in the sphere of circulation and always remains incorporated in the process of production by virtue of this continuous renewal. Hence, however different otherwise may be the relation between labour-power, so far as the creation of value is concerned, and the component parts of constant capital which do not constitute fixed capital, this kind of turnover of its value labour-power shares with them, in contradistinction to fixed capital. These components of the productive capital — the parts of its value invested in labour-power and in means of production which do not constitute fixed capital — by reason of their common turnover characteristics confront the fixed capital as circulating or fluent capital.
From the foregoing one may conclude the following:
1. The definiteness of form of fixed and circulating capitalarises merely from the different turnovers of the capital-value, functioning in the process of production, or of the productive capital. This difference in turnover arises in its turn from the different manner in which the various components of productive capital transfer their value to the product; it is not due to the different parts played by these components in the generation of product value, nor to their characteristic behavior in the process of self-expansion.
2. The turnover of the fixed component part of capital, and therefore also the time of turnover necessary for it, comprises several turnovers of the circulating constituents of capital. In the time during which the fixed capital turns over once, the circulating capital turns over several times. One of the component parts of the value of the productive capital acquires the definiteness of form of fixed capital only in case the means of production in which it exists is not wholly worn out in the time required for the fabrication of the product and its expulsion from the process of production as a commodity. One part of its value must remain tied up in the form of the still preserved old use-form, while the other part is circulated by the finished product, and this circulation on the contrary simultaneously circulates the entire value of the fluent component parts of the capital.
3. The value-part of the productive capital, the part invested in fixed capital, is advanced in one lump sum for the entire period of employment of that part of the means of production of which the fixed capital consists. Hence this value is thrown into the circulation by the capitalist all at one time. But it is withdrawn again from the circulation only piecemeal and gradually by realizing the parts of value which the fixed capital adds piecemeal to the commodities. On the other hand the means of production themselves, in which a component part of the productive capital becomes fixed, are withdrawn from the circulation all at one time to be embodied in the process of production for the entire period in which they function. But they do not require for this period any replacement by new samples of the same kind, do not require reproduction. They continue for a longer or shorter period to contribute to the creation of the commodities thrown into circulation without withdrawing from circulation the elements of their own renewal. Hence they do not require from the capitalist a renewal of his advance during this period.
4. The elements of circulating capital are as permanently fixed in the process of production — if it is to be uninterrupted — as the elements of fixed capital. But the elements of circulating capital thus fixed are continually renewed in kind (the means of production by new products of the same kind, labour-power by constantly renewed purchases) while in the case of the elements of fixed capital neither they themselves are renewed nor need their purchases be renewed so long as they continue to exist. There are always raw and auxiliary materials in the process of production, but always new products of the same kind, after the old elements have been consumed in the creation of the finished product. Labour-power likewise always exists in the process of production, but only by means of ever new purchases, frequently involving changes of persons. But the same identical buildings, machines, etc., continue to function, during repeated turnovers of the circulating capital, in the same repeated processes of production.
