The figures in this diagram express quantities of value, amounts of money which are chosen arbitrarily, but their ratios are exact. Each department is characterised by the use-form of the commodities produced. Their mutual circulation takes place as follows: Department I supplies the means of production for the entire productive process, for itself as well as for Department II. From this alone it follows that for the undisturbed continuance of reproduction—for we still presume simple reproduction on the old scale—the total produce of Department I (I 6,000) must have the same value as the sum of constant capitals in both departments: (I 4,000c + II 2,000c). Similarly, Department II supplies provisions for the whole of society, for its own workers and capitalists as well as for the workers and capitalists of Department I. Hence it follows that for the undisturbed course of consumption and production and its renewal on the old scale it is necessary that the total quantity of provisions supplied by Department II should equal in value all the incomes of the employed workers and capitalists of society [here II 3,000 = I(1,000v + 1,000s) + II(500v + 500s)].
Here we have indeed expressed relationships of value which are the foundation not only of capitalist reproduction but of reproduction in every society. In every producing society, whatever its social form, in the primitive small village community of the Bakairi of Brazil, in the oikos of a Timon of Athens with its slaves, or in the imperial corvée farm of Charlemagne, the labour power available for society must be distributed in such a way that means of production as well as provisions are produced in adequate quantities. The former must suffice for the immediate production of provisions as well as for the future renewal of the means of production themselves, and the provisions in their turn must suffice for the maintenance of the workers occupied in the production alike of these same provisions and of the means of production, and moreover for the maintenance of all those who do not work.
In its broad outline, Marx’s scheme corresponds with the universal and absolute foundation of social reproduction, with only the following specifications: socially necessary labour appears here as value, the means of production as constant capital, the labour necessary for the maintenance of the workers as variable capital and that necessary for the maintenance of those who do not work as surplus value.
In capitalist society, however, the connections between these two great departments depend upon exchange of commodities, on the exchange of equivalents. The workers and capitalists of Department I can only obtain as many provisions from Department II as they can deliver of their own commodities, the means of production. The demand of Department II for means of production, on the other hand, is determined by the size of its constant capital. It follows therefore that the sum of the variable capital and of the surplus value in the production of producer goods [here I(1,000v + 1,000s)] must equal the constant capital in the production of provisions [here II(2,000c)].
An important proviso remains to be added to the above scheme. The constant capital which has been spent by the two departments is in reality only part of the constant capital used by society. This constant capital is divided into two parts; the first is fixed capital—premises, tools, labouring cattle—which functions in a number of periods of production, in every one of which, however, only part of its value is absorbed by the product, according to the amount of its wear and tear. The second is circulating capital such as raw materials, auxiliary semi-finished products, fuel and lighting—its whole value is completely absorbed by the new product in every period of production. Yet only that part of the means of production is relevant for reproduction which is actually absorbed by the production of value; without becoming less correct, an exact exposition of social circulation may disregard the remaining part of the fixed capital which has not been absorbed by the product, though it should not completely forget it. This is easy to prove.
Let us assume that the constant capital, 6,000c, in the two departments, which is in fact absorbed by the annual product of these departments, consists of 1,500c fixed and 4,500c circulating capital, the 1,500c of fixed capital representing here the annual wear and tear of the premises, machinery and labouring cattle. This annual wear and tear equals, say, 10 per cent of the total value of the fixed capital employed. Then the total social capital would really consist of 19,500c + 1,500v, the constant capital in both departments being 1,500c of fixed and 4,500c of circulating capital. Since the term of life of the aggregate fixed capital, with a 10 per cent wear and tear, is ten years ex hypothesi, the fixed capital needs renewal only after the lapse of ten years. Meanwhile one-tenth of its value enters into social production in every year. If all the fixed capital of a society, with the same rate of wear and tear, were of equal durability, it would, on our assumption, need complete renewal once within ten years. This, however, is not the case. Some of the various use-forms which are part of the fixed capital may last longer and others shorter, wear and tear and duration of life are quite different in the different kinds and individual representations of fixed capital. In consequence, fixed capital need not be renewed—reproduced in its concrete use-form—all at once, but parts of it are continually renewed at various stages of social production, while other parts still function in their older form. Our assumption of a fixed capital of 15,000c with a 10 per cent rate of wear and tear does not mean that this must be renewed all at once every ten years, but that an annual average renewal and replacement must be effected of a part of the total fixed social capital corresponding to one-tenth of its value; that is to say, Department I which has to satisfy the needs of society for means of production must reproduce, year by year not only all its raw and partly finished materials, etc., its circulating capital to the value of 4,500, but must also reproduce the use-forms of its fixed capital—premises, machinery, and the like—to the extent of 1,500, corresponding with the annual wear and tear of fixed capital. If Department I continues in this manner to renew one-tenth of the fixed capital in its use-form every year, the result will be that every ten years the total fixed capital of society will have been replaced throughout by new items; thus it follows that the reproduction of those parts disregarded so far is also completely accounted for in the above scheme.
In practice, the procedure is that every capitalist sets aside from his annual production, from the realisation of his commodities, a certain amount for the redemption of his fixed capital. These individual annual deductions must amount to a certain quantity of capital, therefore the capitalist has in fact renewed his fixed capital, that is, he has replaced it by new and more efficient items. This alternating procedure of building up annual reserves of money for the renewal of fixed capital and of the periodical employment of the accumulated amounts for the actual renewal of fixed capital varies with the individual capitalist, so that some are accumulating reserves, while others have already started their renewals. Thus every year part of the fixed capital is actually renewed. The monetary procedure here only disguises the real process which characterises the reproduction of fixed capital.
On closer observation we see that this is as it should be. The whole of the fixed capital takes part in the process of production, for physically the mass of usable objects, premises, machinery, labouring cattle, are completely employed. It is their peculiarity as fixed capital, on the other hand, that only part of the value is absorbed in the production of value, since in the process of reproduction (again postulating simple reproduction), all that matters is to replace in their natural form the values which have been actually used up as means of subsistence and production during a year’s production. Therefore, fixed capital need only be reproduced to the extent that it has in fact been used up in the production of commodities. The remaining portion of value, embodied in the total use-form of fixed capital, is of decisive importance for production as a labour process, but does not exist for the annual