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ANNUITY: The receipt of payments at regular intervals from a established fund. Annuities are commonly used for insurance and retirement programs. It works in this way: A fund, which can be established either through a one-time sum of money or a series of payments, is exhausted over time with fixed, periodic payments. The amount of each payment depends on the interest accrued on the outstanding balance in the fund, and the length of time scheduled to exhaust the fund. For example, if your pension plan is based on an annuity that begins payments at the age of 65, then the size of the payments depends on whether you expect to live 5, 10, 15, or more years and set up payments accordingly. It's very similar to amortization, but in the reverse direction.

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MARGINAL COST AND LAW OF DIMINISHING MARGINAL RETURNS

Decreasing then increasing marginal cost, reflected by a U-shaped marginal cost curve, is the result of increasing then decreasing marginal returns. In particular the decreasing marginal returns is caused by the law of diminishing marginal returns. As such, the law of diminishing marginal returns affects not only the short-run production of a firm but also the cost of short-run production. This translates into a positively-sloped supply curve for profit-maximizing competitive firms.

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Today, you are likely to spend a great deal of time searching for rummage sales wanting to buy either storage boxes for your family photos or a large, stuffed giraffe. Be on the lookout for malfunctioning pocket calculators.
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The wealthy industrialist, Andrew Carnegie, was once removed from a London tram because he lacked the money needed for the fare.
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