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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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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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APLS

WHITE GULLIBON
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Today, you are likely to spend a great deal of time at a garage sale wanting to buy either a key chain with a built-in flashlight and panic button or a green and yellow striped sweater vest. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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In the early 1900s around 300 automobile companies operated in the United States.
"Laughter is the shortest distance between two people. "

-- Victor Borge, musician, humorist

UNCTAD
United Nations Conference on Trade and Development
A PEDestrian's Guide
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