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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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PRICE TAKER

A buyer or seller that has no market control and is not able to affect the price of a good. It must "take" or accept the going market price. The market structure that exemplifies price taker is perfect competition. In fact, perfect competition is the only example of price taker. This is one of two alternatives related to control over price. The other is price maker. Price taker is also termed price seeker.

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Today, you are likely to spend a great deal of time looking for a downtown retail store trying to buy either a set of steel-belted radial snow tires or a wall poster commemorating the 2000 Presidential election. Be on the lookout for slow moving vehicles with darkened windows.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
"A man is not finished when he is defeated. He is finished when he quits. "

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