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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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UNIT OF ACCOUNT

The money function in which money is used as the common benchmark to designate the prices of goods exchanged throughout the economy. Unit of account, or measure of value, means money is functioning as the measuring unit for prices. In other words, prices of goods are stated in terms of the monetary unit. This is one of four basic functions of money. The other three are medium of exchange, store of value, and standard of deferred payment.

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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
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MC
Marginal Cost
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