NPR : Viewing Life Through an Economic Prism: "NPR.org, August 14, 2007 · The Cost-Benefit Principle The mother of all economic ideas is the cost-benefit principle. It says that should take an action if, and only if, the extra benefit from taking it is greater than the extra cost. How simple could a principle be? Still, as the following examples illustrate, not everyone finds it easy to apply."
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