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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, MONOPOLISTIC COMPETITION

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

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club wanting to buy either a cross-cut paper shredder or a birthday greeting card for your father. Be on the lookout for telephone calls from long-lost relatives.
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Lombard Street is London's equivalent of New York's Wall Street.
"A stumble may prevent a fall. "

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