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VOLUNTARY EXCHANGE: The process of willingly trading one item for another. The emphasis here is on "willingly." Voluntary exchanges are the heart and soul of market transactions, and should be contrasted with the "involuntary" exchanges mandated by government taxes, laws, and regulations. While involuntary government-forced exchanges play an important role in a mixed economy, economists really, really like voluntary market exchanges because they promote economic efficiency.

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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 looking to buy either a large, stuffed kitty cat or a cross-cut paper shredder. Be on the lookout for crowded shopping malls.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
"When you play, play hard; when you work, don't play at all. "

-- Theodore Roosevelt, 26th US president

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