The riches of a country are to be valued by the quantity of labor its inhabitants are able to purchase, and not by the quantity of silver and gold they possess; which will purchase more or less labor, and therefore is more or less valuable, as is said before, according to its scarcity or plenty.
Benjamin FranklinA [desire] to abolish slavery prevails in North America, many of the Pennsylvanians have set their slaves at liberty, and [Virginia legislators] have petitioned the King for permission to make a law for preventing the importation of more [slaves] into that colony. This request, however, will probably not be granted, as their former laws of that kind have always been repealed.
Benjamin Franklin