However, the transformation from simple commodity production into capitalist "production" accompanying industrialisation requires profound changes in property relations, because it must be possible to trade freely in means of production and labour power (the factors of production). Only when that trade becomes possible, can the whole of production be reorganised to conform to commercial principles. Marx describes capitalist society as "a society where the commodity-form is the universal form of the product of labour, hence the dominant social relation is the relation between men as possessors of commodities". He argues that "The capitalist epoch is... characterized by the fact that labour-power, in the eyes of the worker himself, takes on the form of a commodity which is his property; his labour consequently takes on the form of wage-labour... it is only from this moment that the commodity-form of the products of labour becomes universal." Thus, "...from the moment there is a free sale, by the worker himself, of labour power as a commodity... from then onwards... commodity production is generalized and becomes the typical form of production."