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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, PERFECT COMPETITION

A curve that graphically represents the relation between average revenue received by a perfectly competitive 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 perfectly competitive firm's output.

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Today, you are likely to spend a great deal of time searching the newspaper want ads hoping to buy either a T-shirt commemorating the first day of winter or software that won't crash your computer. Be on the lookout for slightly overweight pizza delivery guys.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
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