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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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AVERAGE REVENUE CURVE A curve that graphically represents the relation between average revenue received by a firm for selling its output and the quantity of output sold. Because average revenue is essentially the price of a good, the average revenue curve is also the demand curve for a firm's output. The average revenue curve for a firm with no market control is horizontal. The average revenue curve for a firm with market control is negatively sloped.
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GREEN LOGIGUIN
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Today, you are likely to spend a great deal of time at a dollar discount store hoping to buy either a replacement battery for your pocket calculator or a how-to book on home remodeling. Be on the lookout for strangers with large satchels of used undergarments.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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"The greatest things ever done on Earth have been done little by little. " -- William Jennings Bryan
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JEP
Journal of Economic Perspectives
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