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AGGREGATE EXPENDITURES: The total expenditures on gross domestic product undertaken in a given time period by the four sectors -- household, business, government, and foreign. Expenditures made by each of these sectors are specifically labeled consumption expenditures, investment expenditures, government purchases, and net exports. Aggregate expenditures (AE) are a cornerstone in the study of macroeconomics, playing critical roles in Keynesian economics, aggregate market analysis, and to a lesser degree, monetarism.

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PERFECT COMPETITION, EFFICIENCY

Perfect competition is an idealized market structure that achieves an efficient allocation of resources. This efficiency is achieved because the profit-maximizing quantity of output produced by a perfectly competitive firm results in the equality between price and marginal cost. In the short run, this involves the equality between price and short-run marginal cost. In the long run, this is seen with the equality between price and long-run marginal cost at the minimum efficient scale of production.

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GREEN LOGIGUIN
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Today, you are likely to spend a great deal of time wandering around the downtown area hoping to buy either a coffee table shaped like the state of Florida or storage boxes for your summer clothes. Be on the lookout for door-to-door salesmen.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"Concentration is the secret of strength in politics, in war, in trade, in short in all management of human affairs. "

-- Ralph Waldo Emerson, philosopher, poet

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Organization of American States
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