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COMPOUND INTEREST: Interest that's added to a principal at regular intervals such that each subsequent interest calculation is based on the original principal and the added interest. For example, suppose you have a $100 savings account that pays 5 percent interest. Without compound interest, such that your 5 percent interest is paid only at the end of a year, you will have exactly $105 in one year. However, if your interest is compounded each month you end up with $105.12 after a year. The extra 12 cents comes from interest on the interest paid the first month, interest on the interest paid the second month, interest on the interest paid the third month... well I could go on.

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MARGINAL REVENUE

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a firm 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 firm equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store seeking to buy either a decorative windchime with plastic or a flower arrangement for that special day for your mother. Be on the lookout for deranged pelicans.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
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