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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

The willingness and ability to buy a range of quantities of a good at a range of prices, during a given time period. Demand is an inverse relation between price (demand price) and quantity (quantity demanded). Demand is one half of the market exchange process--the other is supply. This demand side of the market draws inspiration from the unlimited wants and needs dimension of the scarcity problem.

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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites wanting to buy either an ink cartridge for your printer or a rechargeable battery for your camera. Be on the lookout for cardboard boxes.
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