Capital, Volume Three: The Process of Capitalist Production as a Whole by Karl Marx

In Book I we analysed the phenomena which constitute the process of capitalist production as such, as the immediate productive process, with no regard for any of the secondary effects of outside influences. But this immediate process of production does not exhaust the life span of capital. It is supplemented in the actual world by the process of circulation, which was the object of study in Book II. In the latter, namely in Part III, which treated the process of circulation as a medium for the process of social reproduction, it developed that the capitalist process of production taken as a whole represents a synthesis of the processes of production and circulation. Considering what this third book treats, it cannot confine itself to general reflection relative to this synthesis. On the contrary, it must locate and describe the concrete forms which grow out of the movements of capital as a whole. In their actual movement capitals confront each other in such concrete shape, for which the form of capital in the immediate process of production, just as its form in the process of circulation, appear only as special instances. The various forms of capital, as evolved in this book, thus approach step by step the form which they assume on the surface of society, in the action of different capitals upon one another, in competition, and in the ordinary consciousness of the agents of production themselves.

The value of every commodity produced in the capitalist way is represented in the formula: C = c + v + s. If we subtract surplus-values from this value of the product there remains a bare equivalent or a substitute value in goods, for the capital-value c + v expended in the elements of production.