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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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DATA

Observations or measurements that quantify or otherwise identify some aspect of the real world. Data are used to track economic performance, quantify economic characteristics, and test economic hypotheses. Data collection is often the most challenging part of undertaking an empirical analysis.

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Today, you are likely to spend a great deal of time at a crowded estate auction looking to buy either a box of multi-colored, plastic paper clips or several orange mixing bowls. Be on the lookout for door-to-door salesmen.
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