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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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EIGHT-FIRM CONCENTRATION RATIO

The proportion of total output in an industry produced by the eight largest firms in an industry. This is one of two common concentration ratios. The other is the eight-firm concentration ratio. Another related measure is the Herfindahl index. The eight-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control held by the eight largest firms in the industry.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers seeking to buy either a rechargeable battery for your camera or a coffee cup commemorating the first day of spring. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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This isn't me! What am I?

Lewis Carroll, the author of Alice in Wonderland, was the pseudonym of Charles Dodgson, an accomplished mathematician and economist.
"The way employees treat customers reflects the manner in which they're treated by management. "

-- James Perkins, president, Cornell University

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