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LERNER INDEX: The difference between price (p) and marginal cost (mc) as a fraction of price, that is [p-mc]/p. The Lerner index is usually taken as an indicator of market power because the larger the index, the larger the difference between price and marginal cost, that is, the larger the distance between the price and the competitive price. The Lerner index depends on the elasticity of demand. The Lerner index is also called the price-cost margin.

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FIRST-DEGREE 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 perfect 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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Today, you are likely to spend a great deal of time flipping through mail order catalogs trying to buy either a graduation present for your niece or nephew or a toaster oven that has convection cooking. Be on the lookout for rusty deck screws.
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There were no banks in colonial America before the U.S. Revolutionary War. Anyone seeking a loan did so from another individual.
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