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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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INEFFICIENT

The state of resource allocation that exists when the highest level of consumer satisfaction is not achieved from available resources. This state occurs in market exchanges if the price buyers are willing and able to pay for a good does not reflect the satisfaction everyone obtains from the consuming the good or if the price sellers need to charge for a good does not reflect all opportunity cost of producing the good.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club trying to buy either storage boxes for your family photos or a large, stuffed giraffe. Be on the lookout for defective microphones.
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Mark Twain said "I wonder how much it would take to buy soap buble if there was only one in the world."
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