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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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FALLACY OF DIVISION

The logical fallacy of arguing that what is true for the whole is also true for the parts. In the study of economics, this takes the form of assuming that what works for the aggregate, or macroeconomy, also works for parts of the economy, such as households or businesses. The contrasting fallacy is the fallacy of composition.

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APLS

BLACK DISMALAPOD
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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors trying to buy either a birthday greeting card for your grandfather or a weathervane with a cow on top. 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.
"The way employees treat customers reflects the manner in which they're treated by management. "

-- James Perkins, president, Cornell University

QJE
Quarterly Journal of Economics
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