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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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LONG RUN, MICROECONOMICS

In terms of the microeconomic analysis of production and supply, a period of time in which all inputs under the control of a firm used in the production process are variable. In the long run, labor and capital are variable inputs. The long-run analysis of production reveals the key role played by returns to scale. This is one of four production time periods used in the study of microeconomics. The other three are short run, very long run, and very short run (or market period). The long run is also a time period designation used in the macroeconomic analysis of economic growth and full employment.

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Today, you are likely to spend a great deal of time strolling through a department store hoping to buy either a lazy Susan for you dining room table or a set of serrated steak knives, with durable plastic handles. Be on the lookout for the happiest person in the room.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
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