Perhaps readers can propose some other examples of mathematical concepts being re-interpreted as some sort of economic transaction?
On a much more basic level, I plugged in e to formulae throughout my schooling to the age of 18, and only later realised that $e is equal to the amount of interest you'd have on a bank account of $1 if you applied 100% interest continuously compounded.
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On a much more basic level, I plugged in e to formulae throughout my schooling to the age of 18, and only later realised that $e is equal to the amount of interest you'd have on a bank account of $1 if you applied 100% interest continuously compounded.