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CHANGE IN AGGREGATE EXPENDITURES: The movement along an aggregate demand curve caused by a change in the price level. This should be contrasted directly with a change in aggregate demand. You might also want to review the terms change in quantity demanded and change in demand, as well. A change in aggregate expenditures means that we have identified a NEW level of expenditures on the existing aggregate demand curve. In contrast, a change in aggregate demand means that we have changed, moved, or shifted, the entire aggregate demand curve, the whole range of price levels and aggregate expenditures has changed.

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MARGINAL REVENUE PRODUCT AND FACTOR DEMAND

A perfectly competitive firm's factor demand curve is that negatively-sloped portion of its marginal revenue product curve. A perfectly competitive firm maximizes profit by hiring the quantity of input that equates factor price and marginal revenue product. As such, the firm moves along its negatively-sloped marginal revenue product curve in response to changing factor prices.

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WHITE GULLIBON
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Today, you are likely to spend a great deal of time strolling through a department store seeking to buy either a coffee cup commemorating the 1960 Presidential election or a how-to book on fixing your computer, with illustrations. Be on the lookout for door-to-door salesmen.
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Ragnar Frisch and Jan Tinbergen were the 1st Nobel Prize winners in Economics in 1969.
"The majority of men meet with failure because of their lack of persistence in creating new plans to take the place of those that fail. "

-- Napoleon Hill, author

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