Moreover, there are certain other aspects to be considered. The concept of expanding reproduction applies only to the quantity of products, to the aggregate of manufactured objects. So long as production rests solely or mainly upon a natural economy, consumption determines the extent and character of the individual labour process, as well as that of reproduction in general, as an end in itself: this applies to the agrarian and communist village communities of India, to the Roman _villa_ with its economy of slave labour, and to the medieval feudal farm based on _corvée_. But the picture is different in a capitalist economic system. Capitalist production is not production for the purpose of consumption, it is production for the purpose of creating value. The whole process of production as well as of reproduction is ruled by value relationships. Capitalist production is not the production of consumer goods, nor is it merely the production of commodities: it is pre-eminently the production of surplus value. Expanding reproduction, from a capitalist point of view, is expanding production of surplus value, though it takes place in the forms of commodity production and is thus in the last instance the production of consumer goods. Changes in the productivity of labour during the course of reproduction cause continual discrepancies between these two aspects. If productivity increases, the same amount of capital and surplus value may represent a progressively larger amount of consumer goods. Expanding production, understood as the creation of a greater amount of surplus value, need not therefore necessarily imply expanding reproduction in the capitalist meaning of the term. Conversely, capital may, within limits, yield a greater surplus value in consequence of a higher degree of exploitation such as is brought about by wage-cutting and the like, without actually producing a greater amount of goods. But in both cases the surplus value has a twofold aspect: it is a quantity of value as well as an aggregate of material products, and from a capitalist point of view, its elements in both instances are thus the same. As a rule, an increased production of surplus value results from an increase of capital brought about by addition of part of the appropriated surplus value to the original capital, no matter whether this capitalist surplus value is used for the expansion of an old enterprise or for founding a new one, an independent offshoot. Capitalist expanding reproduction thus acquires the specific characteristics of an increase in capital by means of a progressive capitalisation of surplus value, or, as Marx has put it, by the accumulation of capital.