Smith's basic principle is that the total produce of society, when we consider its value, resolves itself completely into wages, profits and rents: this conception is deeply rooted in his scientific theory that value is nothing but the product of labour. All labour performed, however, is wage labour. This identification of human labour with capitalist wage labour is indeed the classical element in Smith's doctrine. The value of the aggregate product of society comprises both the recompense for wages advanced and a surplus from unpaid labour appearing as profit for the capitalist and rent for the landowner. What holds good for the individual commodity must hold good equally for the aggregate of commodities. The whole mass of commodities produced by society--taken as a quantity of value--is nothing but a product of labour, of paid as well as unpaid labour, and thus it is also to be completely resolved into wages, profits, and rents. It is of course true that raw materials, instruments, and the like, must be taken into consideration in connection with all labour. Yet is it not true also that these raw materials and instruments in their turn are equally products of labour which again may have been paid or unpaid? We may go back as far as we choose, we may twist and turn the problem as much as we like, yet we shall find no element in the value of any commodity--and therefore none in the price--which cannot be resolved purely in terms of human labour. We can distinguish, however, two parts in all labour: one part repays the wages and the other accrues to the capitalist and landlord. There seems nothing left but wages and profits--and yet, there is capital, individual and social capital. How can we overcome this blatant contradiction? The fact that Marx himself stubbornly pursued this matter for a long time without getting anywhere at first as witness his _Theories of the Surplus Value_,[78] proves that this theoretical problem is indeed extremely hard to solve. Yet the solution he eventually hit on was strikingly successful, and it is based upon his theory of value. Adam Smith was perfectly right: nothing but labour constitutes the value of the individual commodity and of the aggregate of commodities. He was equally right in saying that from a capitalist point of view all labour is either paid labour which restores the wages, or unpaid labour which, as surplus value, accrues to the various classes owning the means of production. What he forgot, however, or rather overlooked, is the fact that, apart from being able to create new value, labour can also transfer to the new commodities the old values incorporated in the means of production employed. A baker's working day of ten hours is, from the capitalist point of view, divided into paid and unpaid hours, into _v + s_. But the commodity produced in these ten hours will represent a greater value than that of ten hours' labour, for it will also contain the value of the flour, of the oven