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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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TAXES

Legally mandated payments to government that are NOT made in exchange for a good or service. The primary reason government collects taxes is the revenue needed to pay for government expenditures, especially administrative expenses and the provision of public goods. Taxes are one of two methods of obtaining the revenue the government sector uses to pay for expenditures. The other is government borrowing.

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Today, you are likely to spend a great deal of time at a dollar discount store trying to buy either car battery jumper cables or a dozen high trajectory optic orange golf balls. Be on the lookout for letters from the Internal Revenue Service.
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Much of the $15 million used by the United States to finance the Louisiana Purchase from France was borrowed from European banks.
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