Originally posted by carpedm9587
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(In case I'm not being clear: If Alice gives Bob a quantity of fish in exchange for a horse, then depending on our choice of point of view, we could say either/both that Alice sells the fish for a horse or buys the horse with fish. And vice versa for Bob. Introducing dollars, as a medium of indirect exchange, doesn't change that. If Alice instead receives dollars from Bob and uses the dollars to buy the horse from Charlie, she's ultimately still buying a horse with fish (or selling fish for a horse). And currency is yet another good that is bought and sold.)
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