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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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INCREASING-COST INDUSTRY

A perfectly competitive industry with a positively-sloped long-run industry supply curve that results because expansion of the industry causes higher production cost and resource prices. An increasing-cost industry occurs because the entry of new firms, prompted by an increase in demand, causes the long-run average cost curve of each firm to shift upward, which increases the minimum efficient scale of production.

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The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
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