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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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EFFICIENCY

Generating the most possible satisfaction from a given amount of resources. Efficiency means that this satisfaction of wants and needs cannot be increased by producing more of one good and less of another. This is one of the five economic goals and one of two microeconomic goals. The other goals are full employment, stability, economic growth, and equity.

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Today, you are likely to spend a great deal of time at a dollar discount store seeking to buy either a travel case for you toothbrush or a looseleaf notebook binder. Be on the lookout for slow moving vehicles with darkened windows.
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The wealthy industrialist, Andrew Carnegie, was once removed from a London tram because he lacked the money needed for the fare.
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