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AGGREGATE EXPENDITURE DETERMINANTS: An assortment of ceteris paribus factors that affect aggregate expenditures, but which are assumed constant when the aggregate expenditure line is constructed. Changes in any of the aggregate expenditures determinants cause the aggregate expenditure line to shift. While a wide variety of specific ceteris paribus factors can cause the aggregate expenditure line to shift, it's usually most convenient to group them into the four, broad expenditure categories -- consumption, investment, government purchases, and net exports. The reason is that changes in these expenditures are the direct cause of shifts in the aggregate expenditure line. If any determinant affects aggregate expenditures it MUST affect one of these four expenditures.

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PERFECT COMPETITION, PROFIT MAXIMIZATION

A perfectly competitive firm is presumed to produce the quantity of output that maximizes economic profit--the difference between total revenue and total cost. This production decision can be analyzed directly with economic profit, by identifying the greatest difference between total revenue and total cost, or by the equality between marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time strolling through a department store looking to buy either a coffee cup commemorating the first day of winter or a video game player. Be on the lookout for neighborhood pets, especially belligerent parrots.
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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.
"The past is a foreign country; they do things differently there."

-- Leslie Poles Hartley, Writer

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