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PERFECT COMPETITION, REVENUE DIVISION: The marginal approach to analyzing a perfectly competitive firm's short-run profit maximizing production decision can be used to identify the division of total revenue among variable cost, fixed cost, and economic profit. The U-shaped cost curves used in this analysis provide all of the information needed on the cost side of the firm's decision. The demand curve facing the firm (which is also the firm's average revenue and marginal revenue curves) provides all of the information needed on the revenue side.

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HERFINDAHL INDEX

A measure of concentration of the production in an industry calculated as the sum of the squares of market shares for each firm. This is one method of summarizing the degree to which an industry is oligopolistic and the concentration of market control held by the largest firms in the industry. Two other measures of industry concentration are the four-firm concentration ratio and the eight-firm concentration ratio.

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APLS

RED AGGRESSERINE
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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius seeking to buy either a large stuffed brown and white teddy bear or a replacement washer for your kitchen faucet. Be on the lookout for rusty deck screws.
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The first U.S. fire insurance company was established by Benjamin Franklin in 1752 in Philadelphia.
"The greatest use of life is to spend it for something that will outlast it."

-- William James, psychologist

GARCH
Generalized Autoregressive Conditional Heteroskedasticity
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