I believe the comment about trading a dollar is more a comment on money being the medium of exchange. Humanity had a history without money, and while some barte

I believe the comment about trading a dollar is more a comment on money being the medium of exchange. Humanity had a history without money, and while some bartering still exists, by and large we live in a society where money is how we trade in situations where you have something I want, but I lack something you want.