Economics: Humans only value things monetarily.
Sociology: Uh, I don't ...
Economics: Humans are always rational and value is calculated by a complex inner calculus.
Sociology: Uh, Psy, can you help?
Psychology: That's not how humans ...
Economics: ALSO MY SYSTEM WILL GROW EXPONENTIALLY FOREVER!!
Physics: *drops teacup*
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@denny I won't defend the discipline of Economics (mostly because I don't know enough about it), but Behavioral Economics seems to exist precisely to address this problem and has enough clout to have collected multiple Nobel prizes.
https://en.wikipedia.org/wiki/Behavioral_economics#Honors_and_Awards
