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BARRIER TO ENTRY: An institutional, government, technological, or economic restriction on the entry of firms into a market or industry. The four primary barriers to entry are: resource ownership, patents and copyrights, government restrictions, and start-up costs. Barriers to entry are a key reason for market control and the inefficiency that this generates. In particular, monopoly, oligopoly, monopsony, and oligopsony often owe their market control to assorted barriers to entry. By way of contrast, perfect competition, monopolistic competition, and monopsonistic competition have few if any barriers to entry and thus little or no market control.

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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 at a crowded estate auction trying to buy either a handcrafted bird house or a weathervane with a chicken on top. 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.
"If anything terrifies me, I must try to conquer it. "

-- Francis Charles Chichester, yachtsman, aviator

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