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Monkeys understand economics too
"To Chen’s surprise, Felix and the others responded rationally. When the price of a given food rose, the monkeys bought less of it, and when the price fell, they bought more. The most basic law of economics — that the demand curve slopes downward — held for monkeys as well as humans."
Pretty amazing read! Scroll down to Monkeys wise up and get the hang of money. Oh yeah, I almost forgot -- as expected, female monkeys sell sex for money too.