It's generally assumed that economics is about money, which is incorrect. Economics is about value; it just happens that sometimes money is valuable. This is why behavioral economics has little to do traditional financial dynamics with and more to do with traditional social/psychological dynamics.
I was talking not too long ago about how it tends to be frustrating to get dollar coins back from change machines.
You'd think a dollar coin would be just as valuable as a dollar bill, but it's not. This is because it's easier to lose small metal coins. I was telling my friend that I'd gladly change my dollar coins for bills instead, were I able to find someone who'd find the exchange of equal value (not bloody likely).
Economics is about value (irrational), not strict numerical comparison (rational).
