Charles Francis Bastable, Encyclopædia Britannica, Ninth Edition (1883)
“ What is the ultimate regulator of its value? The value of freely-produced commodities is—according to the ordinary theory of economists—determined by their “cost of production,” or, where the article is produced at different costs, by the cost of production of the most costly portion. We have now to consider how far this theory applies to the special case of money. Gold and silver, the principal materials of money, are the products of mines, and are produced at different costs; therefore the cost of the part produced at greatest cost ought to determine their value. ”
