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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, PERFECT COMPETITION

A curve that graphically represents the relation between the total revenue received by a perfectly competitive firm for selling its output and the quantity of output sold. It is combined with a perfectly competitive 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 searching the newspaper want ads looking to buy either a coffee cup commemorating the first day of winter or a video game player. Be on the lookout for gnomes hiding in cypress trees.
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Cyrus McCormick not only invented the reaper for harvesting grain, he also invented the installment payment for selling his reaper.
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