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COLLUSION: A usually secret agreement among competing firms (mostly oligopolistic firms) in an industry to control the market, raise the market price, and otherwise act like a monopoly. The reason for the secrecy is that such behavior is illegal in the United States under antitrust laws. Collusion is a characteristic trait of oligopolistic industries. Intense competition and interdependent decision-making encourages oligopolistic firms to cooperate. One way to lessen the competition among an oligopolistic rival is to join forces through collusion. (The other way is through merger, but that's another entry.)

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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 a specialty store hoping to buy either a birthday gift for your uncle or a pair of red and purple designer socks. Be on the lookout for cardboard boxes.
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Francis Bacon (1561-1626), a champion of the scientific method, died when he caught a severe cold while attempting to preserve a chicken by filling it with snow.
"Expect people to be better than they are; it helps them to become better. But don't be disappointed when they're not; it helps them to keep trying."

-- Merry Browne, Author

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