The effect of the varying value of the precious metals, when we have once obtained a measure of value, will be easily estimated. The most important point at present is, to consider the effects which must be produced upon the value of commodities in the progress of society, by the changes which necessarily take place in the profits of stock and the corn wages of labour. On the supposition of high profits at an early period of society, and a considerable fall of them subsequently, how are we to measure and compare the value of commodities at these different periods? With regard to those which had continued to cost the same quantity of accumulated and immediate labour, we could not say that they were of the same value, unless we were prepared to assert that the value of commodities is determined solely by the labour employed upon them, not only when the rate of profits is the same but when it is totally different;[G] a proposition which no one can venture to assert in the case of foreign commodities, and which there is as little reason to assert in comparing the commodities of distant periods. If profits were 50 per cent. five hundred years ago, and are 10 per cent. now, the question is, whether a piece of cloth which had cost the same quantity of labour at these different periods would be of the same value. By the supposition it was composed of a greater quantity of profits in the earlier period, and having cost the same quantity of labour, we should naturally conclude that it would be of a higher value. It is said, however, that, although it cost the same quantity of labour, yet that the labour in the former period was of much less value, which would counterbalance the greater quantity of profits, and leave the value obtained by the same quantity of labour the same. But when we are thus referred to the lower value of labour, the principle of compensation which had before been applied is quite forgotten. The corn which pays the labourer is indeed obtained by a smaller quantity of labour, on account of the superior fertility of the soil from which it is raised, but it is sold as the cloth is sold, at a profit of 50 per cent.; and if it be said that, in the case of the cloth, the low value of wages which is supposed to be the result of superior fertility counteracts the high profits and keeps the value of cloth the same, surely it may be said, in the case of the corn which pays the wages, that the smaller quantity of labour necessary to produce it is made up by the greater rate of profits at which it is sold, and the value of wages is thus kept the same.