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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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DEMAND SHOCK

A disruption of market equilibrium caused by a change in a demand determinant and a shift of the demand curve. A demand shock can take one of two forms--a demand increase or a demand decrease. This is one of two disruptions of the market. The other is a supply shock.

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Today, you are likely to spend a great deal of time at a going out of business sale wanting to buy either pink cotton balls or a genuine down-filled comforter. Be on the lookout for celebrities who speak directly to you through your television.
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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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