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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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MARGINAL REVENUE CURVE

A curve that graphically represents the relation between the marginal revenue received by a firm for selling its output and the quantity of output sold. A firm maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve. The marginal revenue curve for a firm with no market control is horizontal. The marginal revenue curve for a firm with market control is negatively sloped and lies below the average revenue curve.

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Today, you are likely to spend a great deal of time browsing about a thrift store trying to buy either a replacement remote control for your television or a replacement nozzle for your shower. Be on the lookout for mail order catalogs with hidden messages.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
"I not only use all the brains that I have, but all that I can borrow. "

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PPP
Purchasing Power Parity
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