54 ON PROFITS. labour, but also on the productiveness of the labour; because, in fact, a rise of profits and a rise in labour are essentially distinct in their nature, the one signifying an increase of proportion, the other an increase in the quantity which a definite portion of labour will command. The proposition, that when labour rises profits must fall, is true only when its rise is not owing to an increase in its productive powers. If labour rises while these productive powers remain the same, profits will inevitably fall. This may be easily proved from the principles already advanced ; for if labour rises in value, whoever purchases labour must give a greater quantity of other things for it, and as the capitalist purchases labour, he must pay more for it. It will be said, perhaps, that he may raise the value of his goods, that is, he may require a greater quantity of other commodities than before, in exchange for his own. But the capitalist who produces these other commodities is in the same predicament, and they cannot both raise their goods. If a raises the value of