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OLIGOPOLY: A market structure dominated by a small number of large firms, selling either identical or differentiated products, and significant barriers to entry into the industry. This is one of four basic market structures. The other three are perfect competition, monopoly, and monopolistic competition.

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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 searching for a specialty store hoping to buy either a birthday greeting card for your aunt or a wall poster commemorating the moon landing. Be on the lookout for jovial bank tellers.
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It's estimated that the U.S. economy has about $20 million of counterfeit currency in circulation, less than 0.001 perecent of the total legal currency.
"Advice is like snow ‚ the softer it falls, the longer it dwells upon and the deeper it sinks into the mind. "

-- Samuel Taylor Coleridge, poet

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