Thinking at the Margin: Why are diamonds more expensive than water? Prof. Mario Villarreal-Diaz answers this question using what economists call marginal analysis. Essentially, the marginal utility of water decreases faster than the marginal utility of diamonds. Put another way, people face decisions in a particular context and time. In modern economies, people have ready access to water on the margin, but do not have the same level of access to diamonds.

If you ordered four slices of pizza, the marginal gain would be defined as Edit

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