The Process of Circulation of Capital (Capital Vol. II). Karl Marx

C equals the value of P, the productive capital, and this equals the value of M, the money advanced in the act M-C, the purchase of the elements of production, amounting to 422 pounds sterling in our example. If the mass of commodities is sold at its value, then C equals 422 pounds sterling, and c, the value of the surplus product of 1,560 pounds of yarn, equals 78 pounds sterling. If we call c, expressed in money, m, then C'-M'=(C+c)-(M+m), and the cycle M-C...P...C'-M', in its expanded form, is represented by M-C{^LPm...P...(C+c)-(M+m).

      In the first stage, the capitalist takes articles of use out of the commodity-market proper and the labor-market. And in the third stage he throws commodities back, but only into one market, the commodity-market proper. But the fact that he extracts from the market, by means of his commodities, a greater value than he threw upon it originally, is due only to the circumstance that he throws more commodity-values back upon it than he first drew out of it. He threw the value M into it and drew out of it the equivalent C; he throws the value C+c back into it, and draws out of it the equivalent M+m.

      M was in our example equal to the value of 8,440 pounds of yarn. But he throws 10,000 pounds of yarn into the market, he returns a greater value than he drew out of it. On the other hand, he threw this increased value into it only by virtue of the fact that he obtained a surplus-value through the exploitation of labor-power (this value being expressed by an aliquot part of the product). The mass of commodities becomes a commodity-capital only by virtue of this process, it is the impersonation of the used-up capital value only through it. By the act C'-M' the advanced capital-value is recovered as well as the surplus-value. The realization of both coincides with that series of sales, or with that one sale, of the entire mass of commodities, which is expressed by C'-M'. But this same act of circulation is different for capital-value and surplus-value, because it expresses for each one of these two values a different stage of their circulation, a different section of the series of metamorphoses through which each of them passes in its circulation. The surplus-value c did not come into the world until the process of production began. It appeared for the first time on the commodity-market in the form of commodities. This is its first form of circulation, hence the act c-m is its first circulation act, or its first metamorphosis, which remains to be supplemented by the reverse circulation, or the opposite metamorphosis, M-c.4

      It is different with the circulation which the capital-value C performs in the same circulation act C'-M', and which constitutes for it the circulation act C-M, in which C is equal to P, the M originally advanced. It opened its circulation in the form of M, money-capital, and returns through the act C-M to the same form. In other words, it has now passed through the two opposite stages of the circulation, first M-C, second C-M, and finds itself once more in the form in which it can begin its cycle anew. What constitutes for surplus-value the first transformation of the commodity-form into that of money, constitutes for capital-value its return, or retransformation, into its original money-form.

      By means of M-C{^LPm, money-capital is transformed into an equivalent mass of commodities, L and Pm. These commodities no longer perform the function of commodities, of articles of sale. Their value now exists in the hands of the capitalist who bought them, they represent the value of his productive capital P. And in the function P, productive consumption, they are transformed into commodities substantially different from the means of production, into yarn, in which their value is not only preserved but increased, rising from 422 pounds sterling to 500 pounds sterling. By means of this metamorphosis, the commodities taken from the market in the first stage, M-C, are replaced by commodities of a different substance and value, which now perform the function of commodities, being exchanged for money and sold. The process of production, therefore, appears to us as an interruption of the process of circulation of capital-value, since up to production it has passed only through the phase M-C. It passes through the second and concluding phase, C-M, after C has been altered in substance and value. But so far as capital-value, considered by itself, is concerned, it has merely gone through a transformation of its use-form in the process of production. It existed in the form of 422 pounds sterling's worth of L and Pm, while now it exists in the form of 8,440 pounds of yarn valued at 422 pounds sterling. If we consider merely the two circulation phases of capital-value, apart from its surplus-value, we find that it passes through the stages M-C and C-M, in which the second C represents a different use-value, but the same exchange-value as the first C. And the process M-C-M is, therefore, a cycle which requires the return of the value advanced in money to its money-form, because the commodity here changes places twice and in the opposite direction, the first change being from the money to the commodity-form, the second from the commodity to the money-form. Capital-value is retransformed into money.

      The same circulation act C'-M', which constituted the second and concluding metamorphosis, a return to the money-form, for capital-value, represents for the surplus-value simultaneously embodied in the commodity-capital, and realized by its exchange for money, its first metamorphosis, its transformation from the commodity to the money-form, C-M, its first circulation phase.

      We have, then, two observations to make. First, the final return of capital-value to its original money-form is a function of commodity-capital. Second, this function includes the first transformation of surplus-value from its original commodity-form to that of money. The money-form, then, plays a double role here. On the one hand, it is a return of a value, originally advanced in money, to its old form, a return to that form of value which opened the process. On the other hand, it is the first metamorphosis of a value which originally enters the circulation in the form of a commodity. If the commodities composing the commodity-capital are sold at their value, as we assume, then C plus c is transformed into M plus m, its equivalent. The sold commodity-capital now exists in the hands of the capitalist in the form of M plus m (422 pounds sterling plus 78 pounds sterling, equal to 500 pounds sterling). Capital-value and surplus-value are now present in the form of money, the form of the general equivalent.

      At the conclusion of the process, capital-value has resumed the form in which it entered, and can now open a new cycle of the same kind, in the form of money-capital, and go through it. Just because the opening and concluding form of this process is that of money-capital, M, we call this form of the circulation process the circulation of money-capital. It is not the form, but merely the magnitude of the advanced value which is changed in the end.

      M plus m is a sum of money of a definite magnitude, in this case 500 pounds sterling. As a result of the circulation of capital, of the sale of commodity-capital, this sum of money contains the capital-value and the surplus-value. And these values are now no longer organically connected, as they were in the yarn, they are now arranged side by side. Their sale has given both of them an independent money form; 211-250th of this money represent the capital value of 422 pounds sterling, and 39-250th constitute the surplus-value of 78 pounds sterling. This separation of capital-value and surplus-value, which results from the sale of the commodity-capital, has not only the formal meaning to which we shall refer presently. It becomes important in the process of the reproduction of capital, according to whether m is entirely, or partially, or not at all, lumped together with M, that is to say according to whether or not it continues to perform the functions of capital-value. Both m and M may also pass through widely different cycles of circulation.

      In M', capital has returned to its original form M, to its money-form. But it then has a form, in which it is materialized capital.

      There is in the first place a difference of quantity. It was M, 422 pounds sterling. It is now M', 500 pounds sterling, and this difference is expressed by the quantitatively different points M...M' of the cycle, the movement of which is indicated by the dots. M' is greater than M, and M'-M is equal to the surplus-value s. But as a result of this cycle M...M' it is only M' which exists now; it is the product which marks the close of the process of formation of money-capital. M' now exists independently of the movement which it started. This movement is completed, and M' exists in its place.

      But M', being M plus m, or in this case 500 pounds sterling, composed of 422 pounds sterling advanced capital plus an increment of 78 pounds sterling, represents at the same time a qualitative relation. It is true that this qualitative relation does not exist outside of the quantitative relation of the parts of one and the same sum. M, the advanced capital, which is now once more present in its original form (422 pounds sterling), exists as the realization of capital. It has not only