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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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U-SHAPED COST CURVES

The family of short-run cost curves consisting of average total cost, average variable cost, and marginal cost, all of which have U-shapes. Each is U-shaped because it begins with relatively high but falling cost for small quantities of output, reaches a minimum value, then has rising cost at large quantities of output. Although the average fixed cost curve is not U-shaped, it is occasionally included with the other three just for sake of completeness.

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GRAY SKITTERY
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Today, you are likely to spend a great deal of time at a garage sale hoping to buy either a remote controlled train set or a genuine down-filled snow parka. Be on the lookout for slow moving vehicles with darkened windows.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
"Argue for your limitations, and sure enough, they're yours."

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