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OLIGOPOLY: A market structure dominated by a small number of large firms, selling either identical or differentiated products, and significant barriers to entry into the industry. This is one of four basic market structures. The other three are perfect competition, monopoly, and monopolistic competition.

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AGGREGATE DEMAND SHIFTS

Changes in the aggregate demand determinants cause the aggregate demand curve to shift. The mechanism is comparable to that for market demand determinants and market demand. There are two alternatives--an increase in aggregate demand and a decrease in aggregate demand. An increase in spending by any of the four sectors--household, business, government, and foreign--shifts the aggregate demand curve to right. A decrease in spending by these four sectors shifts the aggregate demand curve to left.

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YELLOW CHIPPEROON
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Today, you are likely to spend a great deal of time looking for a downtown retail store seeking to buy either a T-shirt commemorating yesterday or a pair of handcrafted oven mitts. Be on the lookout for defective microphones.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
"Anyone who has never made a mistake has never tried anything new. "

-- Albert Einstein, physicist

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Locally Asymptotically Normal
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