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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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BILATERAL MONOPOLY

A market containing a single buyer and a single seller, or the combination of a monopoly market and a monopsony market. A market dominated by a profit-maximizing monopoly tends to charge a higher price. A market dominated by a profit-maximizing monopsony tends to pay a lower price. When combined into a bilateral monopoly, the buyer and seller both cannot maximize profit simultaneously and are forced to negotiate a price and quantity. Then resulting price could be anywhere between the higher monopoly price and the lower monopsony price. Where the price ends ups depends on the relative negotiating power of each side.

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Today, you are likely to spend a great deal of time watching infomercials trying to buy either semi-gloss photo paper that works with your neighbor's printer or a birthday gift for your father that doesn't look like every other birthday gift for your father. Be on the lookout for small children selling products door-to-door.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
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