Note P — THE MEASURE OF VALUE.

In order to exclude demand and supply from the costs of production, when ordinary profits are considered as making a part of them, it would be necessary to assume that the corn wages of labour are always the same, an assumption which would be quite unwarranted, not only in reference to short periods, but to periods of fifty or sixty years, as the history of corn wages in this country alone amply testifies (see ch. iv. sect. 4, of my Princ. of Pol. Econ. &c.); and what but the state of the demand and supply of corn, compared with labour, prevents profits in the United States from being 100 per cent.? The quantity of corn divided between the labourer and capitalist would be amply sufficient to yield such profits, if the corn wages of labour were no higher than in England.