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PERFECT COMPETITION AND EFFICIENCY: Perfect competition is the idealized market structure that achieves an efficient allocation of resources. The conditions of perfect competition, including (1) large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology, ensure that perfect competition efficiently allocates resources. This is in fact the purpose of perfect competition: a market structure that illustrates perfection, the best of all possible resource allocation worlds. The real world falls short of this perfection.

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AVERAGE-MARGINAL RELATION

A mathematical connection between a marginal value and the corresponding average value stating that the change in the average value depends on a comparison between the average and the marginal. This mathematical relation between average and marginal surfaces throughout the study of economics, especially production (average product and marginal product), cost (average total cost and marginal cost), and revenue (average revenue and marginal revenue). A similar relation is that between a total value and the corresponding marginal value.

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APLS

YELLOW CHIPPEROON
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Today, you are likely to spend a great deal of time at a going out of business sale looking to buy either a New York Yankees baseball cap or several magazines on home repairs. Be on the lookout for gnomes hiding in cypress trees.
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One of the largest markets for gold in the United States is the manufacturing of class rings.
"Courage is the ladder on which all the other virtues mount."

-- Claire Boothe Luce, diplomat, writer

BIS
Bank for International Settlements
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