Having obtained a measure of the value of commodities in their more simple forms, we may apply this measure to the ingredients which compose the most complicated productions, and estimate all the advances which consist of accumulated profits, rents, tithes, and taxes in labour. In the case of taxes on the wages of labour, or an increase in the prices of those other necessaries of the labourer, besides food, which may occasion the sale of a greater quantity of the produce, in order to pay the same number of labourers, as these increased advances will have the same effect upon profits as a simple increase of wages, they will in no respect interfere with the constant value of labour, though an increase of wages, under such circumstances, will be of no advantage to the labourer. Cases will of course frequently occur, in which the advances which do not consist of wages vary in a different degree from wages; but still the value of labour will remain constant. If the produce, instead of being obtained by the direct labour of a certain number of men, were obtained by the direct labour of only a part of this number, together with an amount of materials, or other advances consumed in the same time, equal to the labour of the other part, then upon a rise in the corn wages of labour, if the other advances were to fall, or not to be worth so much labour as before, it is obvious that the profits of stock would not fall so much as if the same rise of corn wages had taken place, when all the advances had been in labour; and it might be thought at first that profits not falling in proportion to the rise of labour, the value of labour would not continue the same. But it will be observed, that, in all cases of this kind, there will be a less value of labour, which is equivalent to a less quantity of it employed to obtain the same produce; and a less quantity of labour altogether being consequently necessary to produce the food of the labourer, than if labour alone had been employed, the higher profits, or smaller diminution of the former profits, will only just be such as to maintain labour of a constant value.