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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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PLANNING HORIZON

Another term for the long-run average cost curve. The long-run average cost curve is termed the planning horizon or planning curve because it provides information that a firm can use to plan factory construction and expansion in the long run.

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Today, you are likely to spend a great deal of time wandering around the downtown area hoping to buy either a turbo-powered vacuum cleaner or a battery-powered, rechargeable vacuum cleaner. Be on the lookout for the last item on a shelf.
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