Have you ever traded something with a friend? An old toy for a ball, or a tube of mascara for some foundation?
Vegetable and Spice Market at Benares, c.1840
Then you did something called bartering, which is how people exchanged things before money was invented. (Yep, money was invented.)
So with that in mind, I'm going to have Kyle MacDonald tell you a story, and then we'll talk about the math
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