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Re:There are 5,057 janitors in the U.S. with PhDs by ghb on Friday October 22, 2010 @04:41PM (#1821419)
Serious question: what's utility?
Re:There are 5,057 janitors in the U.S. with PhDs by achompas on Friday October 22, 2010 @05:34PM (#1821613)
Wikipedia calls it "relative satisfaction." I'd call it "personal benefit or gain."

Considering that, it's clear why we'd use money as a proxy. Not a perfect one, of course.