Utility then is not the measure of exchangeable value, although it is absolutely essential to it.
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 RicardoAgain two manufacturers may employ the same amount of fixed, and the same amount of circulating capital; but the durability of their fixed capitals may be very unequal.
David RicardoThe farmer and manufacturer can no more live without profit than the labourer without wages.
David Ricardo