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PERFECT COMPETITION AND SHORT-RUN SUPPLY CURVE: A perfectly competitive firm's supply curve is that portion of its' marginal cost curve that lies above the minimum of the average variable cost curve. A perfectly competitive firm maximizes profit by producing the quantity of output that equates price and marginal cost. As such, the firm moves along it's marginal cost curve in response to alternative prices. Because the marginal cost curve is positively sloped due to the law of diminishing marginal returns, the firm's supply curve is also positively sloped.

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COLLUSION

A usually secret agreement among competing firms in an industry (primarily oligopoly) to dominate the market, control 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 can take one of two forms. Explicit collusion occurs when two or more firms in the same industry formally agree to control the market. Implicit collusion occurs when two or more firms in the same industry control the market through informal, interdependent actions. Collusion is one of two ways oligopoly firms cooperate to avoid competition. The other is through mergers.

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Today, you are likely to spend a great deal of time searching for rummage sales hoping to buy either a rechargeable flashlight or storage boxes for your computer software CDs. Be on the lookout for infected paper cuts.
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