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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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LAW OF COMPARATIVE ADVANTAGE

A principle that states that every nation, worker, or production entity has a production activity that incurs a lower opportunity cost than that of another nation, worker, or production entity, which means that trade between the two can be beneficial to both if each specializes in the production of a good with lower relative opportunity cost. This law is most often studied in the confines of international trade, but it also applies to labor and other types of production.

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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites hoping to buy either a coffee cup commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki or a rechargeable battery for your cell phone. Be on the lookout for neighborhood pets, especially belligerent parrots.
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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
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