Front Page Titles (by Subject) CHAPTER VII.: ADDITIONAL REMARKS. - Capital: A Critique of Political Economy. Volume III: The Process of Capitalist Production as a Whole
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CHAPTER VII.: ADDITIONAL REMARKS. - Karl Marx, Capital: A Critique of Political Economy. Volume III: The Process of Capitalist Production as a Whole 
Capital: A Critique of Political Economy. Volume III: The Process of Capitalist Production as a Whole, by Karl Marx. Ed. Federick Engels. Trans. from the 1st German edition by Ernest Untermann (Chicago: Charles H. Kerr and Co. Cooperative, 1909).
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TAKE it, in accordance with the assumption on which this section is based, that the mass of profit appropriated in any particular sphere of production is equal to the sum of the surplus-values produced by the total capital invested in this sphere. Nevertheless the bourgeois will not consider his profit as identical with the surplus-value, that is to say, with unpaid surplus-labor. And he will do so, for the following reasons.
1) He forgets the process of production in the process of circulation. He is of the opinion that surplus-value is made by his realisation on the value of commodities, which includes realisation on their surplus-value. [There is a blank at this place, indicating that Marx intended to dwell in detail on this point.—F. E.]
2) Assuming a uniform degree of exploitation, we have seen that the rate of profit may differ considerably according to the relative cheapness or dearness of raw materials and the experience of the buyer, according to the relative productivity, efficacy, and cheapness of the machinery employed, according to the greater or lesser perfection of the general equipment of the various stages of the productive process, the simplicity and effectiveness of the management, etc.; all this without reference to any modifications due to the credit-system, to the mutual cheating of the capitalists among themselves, to any favorable choice of the market. In short, given the surplus-value for a certain capital, it depends still very much on the individual business ability of the capitalist, or of his managers and salesmen, whether this same surplus-value realises a greater or smaller rate of profit and thus yields a greater or smaller mass of profit. The same surplus-value of 1,000 p.st., a product of 1,000 p.st. of wages, may be calculated in the business of A on 9,000 p.st., in the business of B on 11,000 p.st. of constant capital. In the case of A we have then p' = 1000/10,000, or 10%. In the case of B we have p' = 1000/12,000, or 8 1/3%. The total capital produces relatively more profit in the business of A than in that of B, although the variable capital advanced in either case is 1,000 p.st., and the surplus-value produced by it likewise 1,000 p.st., so that there is in both cases the same degree of exploitation of the same number of laborers. This difference in the materialisation of the same mass of surplus-value, or the difference in the rates of profit, may also be due to other causes. Still, it may be due wholly to a difference in business ability in both establishments. And this fact leads the capitalist to the conviction that his profits are due, not to the exploitation of labor, but at least, in part, to other circumstances independent of that exploitation, particularly to his individual activity.
The analyses of this part of the work demonstrate the erroneousness of the view (Rodbertus) according to which (in distinction from ground-rent, in the case of which the area of real-estate is said to remain the same and yet to produce a higher rent) a change in the magnitude of a certain capital is said to have no influence on the proportion of profit to capital, and thus on the rate of profit, on the assumption that the mass of capital, on which profits are calculated, grows simultaneously with the mass of profits, and vice versa.
This is true only in two cases. In the first place, it is true, assuming all other circumstances, especially the rate of surplus-value, to remain unchanged, if there is a change in the value of that commodity which is a money-commodity. (The same occurs in the case of a merely nominal change of value, the rise or fall of mere tokens of value while other circumstances remain the same.) Take it that the total capital amounts to 100 p.st., with a profit of 20 p.st., so that the rate of profit is 20%. Now, if gold rises or falls by 50%, the same capital, in the first eventuality, will be worth 150 p.st., which was previously worth only 100 p.st., and the profit will be worth 30 p.st., that is to say, it will be worth that much in money instead of 20 p.st., as before. In the second eventuality, the capital of 100 p.st. will be worth only 50 p.st., and the profit will be represented by the value of 10 p.st. But in either case 150 : 30 = 50 : 10 = 100 : 20 = 20%. But in all these cases there would have been no actual change in the magnitude of capital-value, but only in the money-expression of the same value and the same surplus-value. For this reason s/C, or the rate of profit, could not be affected.
The second case is that in which an actual change of magnitude takes place in the value, but without being accompanied by a change in the proportion of v to c, in other words, when the rate of surplus-value remains the same and the proportion of the variable capital invested in labor-power (considered as an index of the amount of labor-power set in motion) to the constant capital invested in means of production remains the same. Under these circumstances, we may have C, or nC, or C/n, for instance 1,000, or 2,000, or 500. If the rate of profit is 20%, the profit will be 200 in the first case, 400 in the second, and 100 in the third. But 200 : 1,000 = 400 : 2,000 = 100 : 500 = 20%, that is to say the rate of profit remains unchanged, because the composition of capital remains the same and is not effected by its change of magnitude. An increase or decrease in the mass of profit shows therefore merely an increase or decrease in the magnitude of the invested capital.
In the first case, then, there is but seemingly a change in the magnitude of the employed capital, while in the second case there is an actual change of magnitude, but no change in the organic composition of the capital, that is to say, in the relative proportions of the variable and constant portions. With the exception of these two cases, a change in the magnitude of the employed capital is either the result of a preceding change of value in one of the components of capital, and therefore of a change in the relative magnitudes of these components (unless the surplus-value itself varies with the variable capital); or, this change of magnitude (for instance in the case of enterprises on a large scale, the introduction of new machinery, etc.) is the cause of a change in the relative magnitudes of the organic components of capital. In all these cases, other circumstances remaining unchanged, a change in the magnitude of the employed capital must be accompanied simultaneously by a change in the rate of profit.
An increase in the rate of profit is always due to a relative or absolute increase of the surplus-value in proportion to its cost of production, for instance to the advanced total capital, or to a decrease in the difference between the rate of profit and the rate of surplus-value.
Fluctuations in the rate of profit, independently of changes in the organic components of capital, or of the absolute magnitude of the capital, may occur through a rise or fall of the value of the advanced capital, whether it be fixed or circulating, caused by a prolongation or reduction of the working time required for its reproduction, this change in the working time taking place independently of already existing capital. The value of every commodity, including the commodities of which capital consists, is determined, not by the necessary labor-time contained in it individually, but by the social labor-time necessary for its reproduction. This reproduction may take place under aggravating or under propitious circumstances, which differ from the conditions of original production. If it takes under altered conditions double the time, or half as much time, to reproduce the same material capital, and if the value of money remained unchanged, then a capital formerly worth 100 p.st. would be worth 200 p.st. or 50 p.st. If this appreciation or depreciation were to affect all parts of capital uniformly, then the profit would also be expressed correspondingly in double, or half, the amount of money. But if appreciation or depreciation imply a change in the organic composition of capital, if they imply a raising or lowering of the proportion between the variable and constant portions of capital, then the rate of profit, other circumstances remaining the same, will grow with a relatively growing, and fall with a relatively falling, variable capital. If only the money-value of the advanced capital rises or falls (in consequence of a change in the valuation of money) then the money-value of the surplus-value rises or falls in the same proportion. The rate of profit remains unchanged.
CONVERSION OF PROFIT INTO AVERAGE PROFIT.