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MARKET FAILURES: Conditions in which a market does not efficiently allocate resources to achieve the greatest possible consumer satisfaction. The four main market failures are--(1) public good, (2) market control, (3) externality, and (4) imperfect information. In each case, a market acting without any government imposed direction, does not direct an efficient amount of our resources into the production, distribution, or consumption of the good.

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INFORMATION

The transfer of knowledge from one person to another. Information is a flow concept. It requires someone (or something) to do the sending and someone to do the receiving. Information is a valuable commodity that provides benefits, but also incurs an opportunity cost to produce, meaning information is never perfect or complete. The existence of asymmetric information (some have more information than others) gives rise to the problems of adverse selection, moral hazard, and the principal-agent problem.

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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors trying to buy either a T-shirt commemorating last Friday (you know why) or a rotisserie oven that can also toast bread. Be on the lookout for defective microphones.
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This isn't me! What am I?

The standard "debt" notation I.O.U. does not mean "I owe you," but actually stands for "I owe unto..."
"Things turn out best for the people who make the best of the way things turn out."

-- Art Linkletter

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