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PERFECT PRICE DISCRIMINATION: A form of price discrimination in which a seller charges the highest price that buyers are willing and able to pay for each quantity of output sold. This is also termed first-degree price discrimination because the seller is able to extract ALL consumer surplus from the buyers. This is one of three price discrimination degrees. The others are second-degree price discrimination and third-degree price discrimination.

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CONCENTRATION RATIOS

A family of measures of the proportion of total output in an industry that is produced by a given number of the largest firms in the industry. The two most common concentration ratios are for the four largest firms and the eight largest firms. The four-firm concentration ratio is the proportion of total output produced by the four largest firms in the industry and the eight-firm concentration ratio is proportion of total output produced by the eight largest firms in the industry. Concentration ratios are commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control of the largest firms in the industry. A related measure is the Herfindahl index.

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Today, you are likely to spend a great deal of time strolling through a department store looking to buy either a weathervane with a chicken on top or a flower arrangement with daisies and carnations for your uncle. Be on the lookout for letters from the Internal Revenue Service.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
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MRS
Marginal Rate of Substitution
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