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ACTUAL INVESTMENT: Investment expenditures that the business sector actual undertakes during a given time period, including both planned investment and any unplanned inventory changes. This is a critical component of Keynesian economics and the analysis of macroeconomic equilibrium, which occurs when actual investment is equal to planned investment. The difference between planned and actual investment is unplanned investment, which is inventory changes caused by a difference between aggregate expenditures and aggregate output. Should actual and planned investment differ, then aggregate expenditures are not equal to aggregate output, and the macroeconomy is not in equilibrium.

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PERFECT COMPETITION, REVENUE DIVISION

The marginal approach to analyzing a perfectly competitive firm's short-run profit maximizing production decision can be used to identify the division of total revenue among variable cost, fixed cost, and economic profit. The U-shaped cost curves used in this analysis provide all of the information needed on the cost side of the firm's decision. The demand curve facing the firm (which is also the firm's average revenue and marginal revenue curves) provides all of the information needed on the revenue side.

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APLS

ORANGE REBELOON
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Today, you are likely to spend a great deal of time at a going out of business sale wanting to buy either a how-to book on building remote controlled airplanes or an extra large beach blanket. Be on the lookout for small children selling products door-to-door.
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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
"Divide each difficulty into as many parts as is feasible and necessary to resolve it."

-- Rene Descartes

BPEA
Brookings Papers on Economic Activity
A PEDestrian's Guide
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