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April 14, 2026 

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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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PERFECT COMPETITION, EFFICIENCY

Perfect competition is an idealized market structure that achieves an efficient allocation of resources. This efficiency is achieved because the profit-maximizing quantity of output produced by a perfectly competitive firm results in the equality between price and marginal cost. In the short run, this involves the equality between price and short-run marginal cost. In the long run, this is seen with the equality between price and long-run marginal cost at the minimum efficient scale of production.

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[What's This?]

Today, you are likely to spend a great deal of time flipping through the yellow pages hoping to buy either a handcrafted bird house or a weathervane with a chicken on top. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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This isn't me! What am I?

The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"Difficulty is the excuse history never accepts. "

-- Edward R. Murrow, News broadcaster

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International Institute of Public Finance
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