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MARGINAL REVENUE: The change in total revenue resulting from a change in the quantity of output sold. For a perfectly competitive firm, marginal revenue is equal to price.

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MARKET FAILURES

Imperfections in the exchange process between buyers and sellers that prevent markets from efficiently allocating scarce resources. Market failures come in four varieties -- public goods, market control, externalities, and imperfect information. Market efficiency is achieved if the value of goods produced is equal to the value of foregone production. Markets fail when this efficiency condition is not achieved. Such failures can only be corrected by government intervention.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs wanting to buy either a birthday gift for your grandfather or a pleather CD case. Be on the lookout for celebrities who speak directly to you through your television.
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Okun's Law posits that the unemployment rate increases by 1% for every 2% gap between real GDP and full-employment real GDP.
"The true idealist pursues what his heart says is right in a way that his head says will work. "

-- Richard Nixon, 37th US president

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