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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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TOTAL VARIABLE COST AND TOTAL PRODUCT

Because variable cost is largely associated with the cost of employing at least one variable input in the short run, the total variable cost curve can be derived from the total product curve. This admittedly simplistic connection between total product and total variable cost is designed to illustrate the fundamental role that the law of diminishing marginal returns plays in the slope and shape of the total variable cost curve. Because he slope of the total variable cost curve, which is also the slope of the total cost curve, is marginal cost, this analysis also indicates how the law of diminishing marginal returns relates to marginal cost.

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Today, you are likely to spend a great deal of time searching for rummage sales wanting to buy either an electric coffee pot with automatic shutoff or a brown leather attache case. Be on the lookout for letters from the Internal Revenue Service.
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This isn't me! What am I?

Al Capone's business card said he was a used furniture dealer.
"How we spend our days is, of course, how we spend our lives. "

-- Annie Dillard, essayist

LRTC
Long Run Total Cost
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