The exchangeable value of all commodities rises as the difficulties of their production increase.
David RicardoThe produce of the earth - all that is derived from its surface by the united application of labour, machinery, and capital, is divided among three classes of the community, namely, the proprietor of the land, the owner of the stock or capital necessary for its cultivation, and the labourers by whose industry it is cultivated.
David RicardoA rise of wages from this cause will, indeed, be invariably accompanied by a rise in the price of commodities; but in such cases, it will be found that labour and all commodities have not varied in regard to each other, and that the variation has been confined to money.
David RicardoA rise in wages, from an alteration in the value of money, produces a general effect on price, and for that reason it produces no real effect whatever on profits.
David Ricardo