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MARKET EFFICIENCY: The notion that a competitive market automatically achieves an efficient allocation of resources by equating demand price with supply price and quantity demanded with quantity supplied. Market efficiency relies on the self-correction process that eliminates shortages or surpluses. It also presumes that the market is competitive and is not subject to assorted market failures.

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MARGINAL REVENUE CURVE, PERFECT COMPETITION

A curve that graphically represents the relation between the marginal revenue received by a perfectly competitive firm for selling its output and the quantity of output sold. Because a perfectly competitive firm is a price taker and faces a horizontal demand curve, its marginal revenue curve is also horizontal and coincides with its average revenue (and demand) curve. A perfectly competitive firm maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve.

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