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AGGREGATE EXPENDITURE EQUATION: An equation indicating that aggregate expenditures (AE) are the sum of consumption expenditures (C), investment expenditures (I), government purchases (G), and net exports (X-M), stated as: AE = C + I + G + (X-M). This equation surfaces in the Keynesian economic income-expenditure model in the form of the aggregate expenditures line. However, it's also central throughout the study of macroeconomics, including aggregate demand and the measurement of gross domestic product.
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PERFECT COMPETITION An ideal market structure characterized by a large number of small firms, identical products sold by all firms, freedom of entry into and exit out of the industry, and perfect knowledge of prices and technology. This is one of four basic market structures. The other three are monopoly, oligopoly, and monopolistic competition. Perfect competition is an idealized market structure that is not observed in the real world. While unrealistic, it does provide an excellent benchmark that can be used to analyze real world market structures. In particular, perfect competition efficiently allocates resources.
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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time searching the newspaper want ads looking to buy either an AC adapter for your CD player or storage boxes for your family photos. Be on the lookout for door-to-door salesmen.
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Two and a half gallons of oil are needed to produce one automobile tire.
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"New ideas pass through three periods: - It can't be done. - It probably can be done, but it's not worth doing. - I knew it was a good idea all along!" -- Arthur C. Clarke
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WIPO
World Intellectual Property Organization
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