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VALUE IN EXCHANGE: The ability to trade an item, especially money, for other goods and services that can then be used to satisfy wants and needs. Value in exchange means that value, that is satisfaction, is obtained indirectly through the acquisition of something else. For an item to have value in exchange it need NOT have value in use, value obtained directly from the consumption of a good or service.

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MARGINAL REVENUE CURVE, MONOPOLISTIC COMPETITION

A curve that graphically represents the relation between the marginal revenue received by a monopolistically competitive firm for selling its output and the quantity of output sold. Because a monopolistically competitive firm is a price maker and faces a negatively-sloped demand curve, its marginal revenue curve is also negatively sloped and lies below its average revenue (and demand) curve. A monopolistically competitive firm maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve.

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PURPLE SMARPHIN
[What's This?]

Today, you are likely to spend a great deal of time at an auction trying to buy either storage boxes for your winter clothes or several magazines on time travel. Be on the lookout for crowded shopping malls.
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This isn't me! What am I?

A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"Man is born to live, not to prepare for life. "

-- Boris Pasternak, writer

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National Bureau of Economic Research
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