It has therefore been justly observed that however honestly the coin of a country may conform to its standard, money made of gold and silver is still liable to fluctuations in value, not only to accidental, and temporary, but to permanent and natural variations, in the same manner as other commodities.
David RicardoUtility then is not the measure of exchangeable value, although it is absolutely essential to it.
David RicardoNeither machines, nor the commodities made by them, rise in real value, but all commodities made by machines fall, and fall in proportion to their durability.
David Ricardo