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DECREASING-COST INDUSTRY: A perfectly competitive industry with a negatively-sloped long-run industry supply curve that results because expansion of the industry causes lower production cost and resource prices. For a decreasing-cost industry the entry of new firms, prompted by an increase in demand, causes the long-run average supply curve of each firm to shift downward, which decreases the minimum efficient scale of production.

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PERFECT COMPETITION, CHARACTERISTICS

The four key characteristics of perfect competition are: (1) a large number of small firms, (2) identical products sold by all firms, (3) perfect resource mobility or the freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers hoping to buy either an AC adapter for your CD player or storage boxes for your family photos. Be on the lookout for defective microphones.
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Two and a half gallons of oil are needed to produce one automobile tire.
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Arbitrage Pricing Theory
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