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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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VALUE IN USE

The satisfaction of wants and needs provided by the direct consumption of goods and services. Acquiring value from the use of goods and services is really the ultimate goal of economic activity. It is the final step in the production, allocation, and consumption activities that are undertaken to address the fundamental problem of scarcity. Value in use should be contrasted with the similar phrase, value in exchange.

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Today, you are likely to spend a great deal of time searching for a specialty store seeking to buy either pink cotton balls or a genuine down-filled comforter. Be on the lookout for cardboard boxes.
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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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