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MACROECONOMIC SECTORS: The four aggregate sectors of the macroeconomy--household, business, government, and foreign--that reflect four key macroeconomic functions and are responsible for four expenditures on gross domestic product. These four sectors are the primary "actors" on the macroeconomic stage. Macroeconomic theories then explain macroeconomic phenomena by exploring the interaction among these four sectors.
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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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ORANGE REBELOON
[What's This?]
Today, you are likely to spend a great deal of time wandering around the shopping mall wanting to buy either a rotisserie oven that can also toast bread or a flower arrangement in a coffee cup for your father. Be on the lookout for malfunctioning pocket calculators.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
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"Try not to become a man of success, but rather try to become a man of value. " -- Albert Einstein
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QJE
Quarterly Journal of Economics
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