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2answers
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When can one safely talk about decreasing marginal utility?

One thing I hear a lot is talk of decreasing marginal utility—the idea being that additional units of a good become progressively less attractive the more units of that good one has already. However, ...
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Most important but untested theories in economics? [closed]

In the opinion of the economists here, what are some of the more important theories in economics that remain untested? By untested I mean theories that, though perhaps evaluated using empirical data, ...