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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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CHANGE IN DEMAND

A shift of the demand curve caused by a change in one of the demand determinants. A change in demand is caused by any factor affecting demand EXCEPT price. A related, but distinct, concept is a change in quantity demanded.

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Today, you are likely to spend a great deal of time at a flea market trying to buy either a 200-foot blue garden hose or a video camera with stop action features. Be on the lookout for letters from the Internal Revenue Service.
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A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
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