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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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CHANGE IN SUPPLY

A shift of the supply curve caused by a change in one of the supply determinants. A change in supply is caused by any factor affecting supply EXCEPT price. A related, but distinct, concept is a change in quantity supplied.

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Today, you are likely to spend a great deal of time searching for rummage sales wanting to buy either a wall poster commemorating the first day of spring or a lazy Susan for you dining room table. Be on the lookout for door-to-door salesmen.
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In the early 1900s around 300 automobile companies operated in the United States.
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