The Wealth of Nations by Part 4 Chapter 1 Page 3

Plano Carpino, a monk, sent ambassador from the King of France to one of the sons of the famous Genghis Khan, says that the Tartars used frequently to ask him if there was plenty of sheep and oxen in the kingdom of France.

Their inquiry had the same object with that of the Spaniards. They wanted to know if the country was rich enough to be worth the conquering. Among the Tartars, as among all other nations of shepherds, who are generally ignorant of the use of money, cattle are the instruments of commerce and the measures of value. Wealth, therefore, according to them, consisted in cattle, as according to the Spaniards it consisted in gold and silver. Of the two, the Tartar notion, perhaps, was the nearest to the truth.

Mr. Locke remarks a distinction between money and other movable