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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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BUYERS' MARKET

A disequilibrium condition in a competitive market that has a surplus or excess supply. Because the quantity supplied is greater than the quantity demanded, buyers have the "upper hand" when negotiating. A market surplus also goes by the more common term of buyers' market. The alternative to a buyers' market is a sellers' market, which has a shortage or excess demand.

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Today, you are likely to spend a great deal of time at a crowded estate auction trying to buy either a birthday gift for your aunt or a pair of leather sandals that won't cause blisters. Be on the lookout for cardboard boxes.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
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