In Introductory Microeconomics, we have been discussing trade. We all know that Adam Smith wrote that trade was a result of people’s “propensity to truck, barter, and exchange one thing for another.” But did you know that he also wrote “Nobody ever saw a dog make a fair and deliberate exchange of one bone for another with another dog.┬áNobody ever saw one animal by its gestures and natural cries signify to another, this is mine, that yours; I am willing to give this for that.” (Wealth of Nations, Book I, Chapter II) This video calls all of that into question, it would seem (thanks to Adam King). On a related note, listen to this podcast from NPR to get an interesting perspective on early trade (thanks to Max Randolph).