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 RicardoProfits might also increase, because improvements might take place in agriculture, or in the implements of husbandry, which would augment the produce with the same cost of production.
David RicardoThe exchangeable value of all commodities rises as the difficulties of their production increase.
David Ricardo