It appears, then, that the tendency of an increase of capital and population is to add to rent at the expense of profits: though rent does not gain all that profits lose, a part being absorbed in increased expenses of production, that is, in hiring or feeding a greater number of labourers to obtain a given amount of agricultural produce. By profits, must of course be understood the rate of profit; for a lower rate of profit on a larger capital may yield a larger gross profit, considered absolutely, though a smaller in proportion to the entire produce.
This tendency of profits to fall, is from time to time counteracted by improvements in production: whether arising from increase of knowledge, or from an increased use of the knowledge already possessed. This is the third of the three elements, the effects of which on the distribution of the produce we undertook to investigate; and the investigation will be facilitated by supposing, as in the case of the other two elements, that it operates, in the first instance, alone.
§ 4.Let us then suppose capital and population stationary, and a sudden improvement made in the arts of production; by the invention of more efficient machines, or les's costly processes, or by obtaining access to cheaper commodities through foreign trade.
The improvement may either be in some of the necessaries or indulgences which enter into the habitual consumption of the labouring class; or it may be applicable only to luxuries consumed exclusively by richer people. Very few, however, of the great industrial improvements are altogether of this last description. Agricultural improvements, except such as specially relate to some of the rarer an d more peculiar products, act directly upon the principal objects of the labourer's expenditure. The steam-engine, and every other invention which affords a manageable power, are applicable to all things, and of course to those consumed by the
