The concept of "marginal" or "at the margin" in (roughly) the economics sense provides many insights, considering how simple an idea it is.
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@sebinsua Actually had trouble finding anything good. This is decent though: http://www.econlib.org/library/Topics/College/margins.html … -
@sebinsua What made me think of it today: somebody ranting about how important their profession is, what an injustice others are paid more. - 1 more reply
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