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MARGINAL REVENUE, MONOPOLISTIC COMPETITION: The change in total revenue received by a monopolistically competitive firm resulting from a change in the quantity of output sold. For a monopolistically competitive firm, marginal revenue is less than the price.

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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 surfing the Internet hoping to buy either a pair of gray heavy duty boot socks or a 50-foot blue garden hose. Be on the lookout for telephone calls from long-lost relatives.
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Two and a half gallons of oil are needed to produce one automobile tire.
"In the long run men hit only what they aim at. "

-- Henry David Thoreau, philosopher

IGARCH
Integrated Generalized Autoregressive Conditional Heteroskedasticity
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