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ABILITY-TO-PAY PRINCIPLE: A principle of taxation in which taxes are based on the income or resource-ownership ability of people to pay the tax. The income tax collected by our friends at the Internal Revenue Service is one of the most common taxes that seeks to abide by the ability-to-pay principle. In theory, the income tax system is set up such that people with greater incomes pay more taxes. Proportional and progressive taxes follow this ability-to-pay principle, while regressive taxes, such as sales taxes and Social Security taxes, don't.

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MARGINAL REVENUE, MONOPOLY

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a monopoly receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a monopoly equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time touring the new suburban shopping complex wanting to buy either decorative garden figurines or a wall poster commemorating last Friday (you know why). Be on the lookout for telephone calls from long-lost relatives.
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Natural gas has no odor. The smell is added artificially so that leaks can be detected.
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