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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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ELASTICITY ALTERNATIVES, SUPPLY

Five categories of the price elasticity of supply that reflect the entire range of the relative responsiveness of a change in quantity supplied to a change in price. These five alternatives--perfectly elastic, relatively elastic, unit elastic, relatively inelastic, and perfectly inelastic--are often illustrated by different supply curves. The price elasticity of demand is also reflected by five comparable alternatives.

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Today, you are likely to spend a great deal of time at a crowded estate auction wanting to buy either a pair of red and purple designer socks or a T-shirt commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki. Be on the lookout for malfunctioning pocket calculators.
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North Carolina supplied all the domestic gold coined for currency by the U.S. Mint in Philadelphia until 1828.
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