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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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INCOME EFFECT

The change in quantity demanded that results because a change in the demand price of a good affects real income (that is, the purchasing power of income) even though nominal income remains the same. This is one of two reasons, or effects, underlying the law of demand and the negative slope of the market demand curve. The other is the substitution effect.

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