This should be reversed: labour must be all, and capital nothing. This literature was contemporaneous with the emergence of the English revolutionary Labour movement, from which Chartism arose at a later date. Piercy Ravenstone (1821) called capital a metaphysical (airy, impalpable) entity. Hodgskin (1827) called it a fetish, whereas they described labour as the economic reality. The expressions surplus-product and surplus-value were already known to this anti-capitalist school, with which Marx also connected himself when he set to work to elaborate his criticism of political economy.[7] But this literature supplied him with much less material for the construction of the theory of surplus value than the formulation of the theory of value of the classical economy. Besides, while the English anti-capitalist critics, like Ravenstone, Gray, Hodgskin, and J.F. Bray merely condemned surplus value as immoral and as the source of all social wrongs, Marx used the theory of surplus value as the key to unlock the mechanism of the capitalist system and to reveal its workings, its tendencies, and its final destiny. This appears to be the real difference between the English anti-capitalist critics and Marx. In this matter he was obliged to perform most of the work himself. The question he put was no longer "What is the substance of wealth and how is it measured?" but "How is its growth and continual accretions to be explained?" Capital is that portion of wealth which is employed for the purpose of gain, of increase. Whence comes this gain, this increase? The answer is as follows: All capital that is embarked on a productive undertaking consists of two parts: one part is expended on the technical means of production--on buildings, machines, tools, and raw materials, the other on wages. The first part Marx calls Constant Capital (c), the other part Variable Capital (v). The first is called constant, because it only adds to the commodities just as much value as it loses in the course of the productive process; it creates no fresh value: Marx also calls it the passive portion. The outlay on wages is called variable capital because it undergoes an alteration in the process of production: it creates new additional value: Marx also called variable capital the active portion, for it creates surplus value (s). This composition of capital of constant and variable parts Marx calls its organic composition. He calls it average or normal composition when the capital of a business is 80 per cent. constant and 20 per cent. variable. If the constant part is higher, and the variable part lower, he calls it capital of a high composition.