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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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PERFECT COMPETITION

An ideal market structure characterized by a large number of small firms, identical products sold by all firms, freedom of entry into and exit out of the industry, and perfect knowledge of prices and technology. This is one of four basic market structures. The other three are monopoly, oligopoly, and monopolistic competition. Perfect competition is an idealized market structure that is not observed in the real world. While unrealistic, it does provide an excellent benchmark that can be used to analyze real world market structures. In particular, perfect competition efficiently allocates resources.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs hoping to buy either a flower arrangement with anything but tulips for your grandfather or a birthday greeting card for your mother that doesn't look like a greeting card. Be on the lookout for attractive cable television service repair people.
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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
"I know the price of success; dedication, hard work and an unremitting devotion to the things you want to see happen. "

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