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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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Lesson 12: Elasticity and Demand | Unit 2: The Continuum Page: 8 of 25

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  • Let's now consider the remaining two alternatives on the elasticity continuum:

    • Relatively Elastic: Relatively elastic demand results when small changes in price lead to relatively larger changes in quantity.

    • Relatively Inelastic: Relatively inelastic demand results large changes in price result in relatively small changes in quantity demanded.

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INFORMATION SEARCH

The decision to seek out or produce information based on a comparison of the cost of acquiring the information and the benefit obtained from the information. Efficient information search is achieved with a equality between the marginal cost of search and the marginal benefit of search. Because the marginal cost of search is invariably greater than zero, search effort stops short of acquiring complete information.

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Today, you are likely to spend a great deal of time lost in your local discount super center hoping to buy either several magazines on computer software or a T-shirt commemorating the second moon landing. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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It's estimated that the U.S. economy has about $20 million of counterfeit currency in circulation, less than 0.001 perecent of the total legal currency.
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