of commodities and can be expressed by the same formula _c + v + s_. Part _c_ recompenses the capitalist for his advances on means of production that have been used up, part _v_ recompenses him for his advances on wages, and the last part, _s_, represents the expected surplus, the capitalist's clear profit in cash.[59] This conversion of capital from its original form, from the starting point of all capitalist production, into means of production, dead and living, such as raw materials, instruments, and labour; its further conversion into commodities by a living labour process; and its final reconversion into money, a greater amount of money indeed than at the initial stage--this transformation of capital is, however, required for more than the production and appropriation of surplus value. The aim and incentive of capitalist production is not a surplus value pure and simple, to be appropriated in any desired quantity, but a surplus value ever growing into larger quantities, surplus value _ad infinitum_. But to achieve this aim, the same magic means must be used over and over again, the means of capitalist production--the ever repeated appropriation of the proceeds of unpaid wage labour in the process of commodity manufacture, and the subsequent realisation of the commodities so produced. Thus quite a new incentive is given to constantly renewed production, to the process of reproduction as a regular phenomenon in capitalist society, an incentive unknown to any other system of production. In every other economic system known to history, reproduction is determined by the unceasing need of society for consumer goods, whether they are the needs of all the workers determined in a democratic manner as in an agrarian and communist market community, or the despotically determined needs of an antagonistic class society, as in an economy of slave labour or _corvée_ and the like. But in a capitalist system of production, it is not consideration of social needs which actuates the individual private producer who alone matters in this connection. His production is determined entirely by the effective demand, and even this is to him a mere means for the realisation of surplus value which for him is indispensable. Appropriation of surplus value is his real incentive, and production of consumer goods for the satisfaction of the effective demand is only a detour when we look to the real motive, that of appropriation of surplus value, although for the individual capitalist it is also a rule of necessity. This motive, to appropriate surplus value, also urges him to re-engage in reproduction over and over again. It is the production of surplus value which turns reproduction of social necessities into a _perpetuum mobile_. Reproduction, for its part, can obviously be only resumed when the products of the previous period, the commodities, have been realised; that is, converted into money; for capital in the form of money, in the form of pure value, must always be