That whole "money-as-substitue-for-all-valuations" thing is an underlying assumption of nearly all of modern microeconomics. In technical terms, it's a quasili

That whole "money-as-substitue-for-all-valuations" thing is an underlying assumption of nearly all of modern microeconomics. In technical terms, it's a quasilinear utility function[0], where preferences are linear in money. [0] http://en.wikipedia.org/wiki/Quasilinear_utility http://en.wikipedia.org/wiki/Quasilinear_utility