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PERFECT COMPETITION, PROFIT MAXIMIZATION: A perfectly competitive firm is presumed to produce the quantity of output that maximizes economic profit--the difference between total revenue and total cost. This production decision can be analyzed directly with economic profit, by identifying the greatest difference between total revenue and total cost, or by the equality between marginal revenue and marginal cost.

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ADVERSE SELECTION

An inefficient, bad, or adverse outcome of a market exchange that results because buyers and/or sellers make decisions based on asymmetric information. This commonly results in a market that exchanges a lesser quality good, what is termed the market for lemons. Two related problems resulting from asymmetric information are moral hazard and the principal-agent problem. Two methods of lessoning the problem of adverse selection are signalling and screening.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers wanting to buy either a large, stuffed kitty cat or a cross-cut paper shredder. Be on the lookout for strangers with large satchels of used undergarments.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
"For a writer, published works are like fallen flowers, but the expected new work is like a calyx waiting to blossom."

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