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A POSTERIORI: A conclusion reached through logical reasoning based on facts and observations about the real world. This notion is closely related to the scientific verification of hypotheses and the identification of principles. A similar sounding, but opposite term is a prior, which is a unverified presumption made before an analysis is undertaken. For example, in the study of economics of crime you might assume, a priori, that people are basically "good", and conclude, a posteriori, that people are more likely to commit crimes when the threat of capture and conviction is lower.

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MARGINAL REVENUE

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a firm equates marginal revenue and marginal cost.

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YELLOW CHIPPEROON
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Today, you are likely to spend a great deal of time touring the new suburban shopping complex hoping to buy either a lighted magnifying glass or a small, foam rubber football. Be on the lookout for door-to-door salesmen.
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The average length of a "business lunch" is about 36 minutes.
"There is a way to look at the past. Don't hide from it. It will not catch you - if you don't repeat it."

-- Pearl Bailey, Singer and Actress

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American Economic Review
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