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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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TOTAL REVENUE CURVE, MONOPOLY

A curve that graphically represents the relation between the total revenue received by a monopoly firm for selling its output and the quantity of output sold. It is combined with a monopoly firm's total cost curve to determine economic profit and the profit maximizing level of production. The slope of the total revenue curve is marginal revenue.

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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 wall poster commemorating the moon landing or storage boxes for your winter clothes. Be on the lookout for gnomes hiding in cypress trees.
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Lewis Carroll, the author of Alice in Wonderland, was the pseudonym of Charles Dodgson, an accomplished mathematician and economist.
"Stand up to your obstacles and do something about them. You will find that they haven't half the strength you think they have."

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