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LONG-RUN AVERAGE COST CURVE: A curve depicting the per unit cost of producing a good or service in the long run when all inputs are variable. The long-run average cost curve (usually abbreviated LRAC) can be derived in two ways. On is to plot long-run average cost, which is, long-run total cost divided by the quantity of output produced. at different output levels. The more common method, however, is as an envelope of an infinite number of short-run average total cost curves. Such an envelope is base on identifying the point on each short-run average total cost curve that provides the lowest possible average cost for each quantity of output. The long-run average cost curve is U-shaped, reflecting economies of scale (or increasing returns to scale) when negatively-sloped and diseconomies of scale (or decreasing returns to scale) when positively sloped. The minimum point (or range) on the LRAC curve is the minimum efficient scale.

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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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