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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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MARGINAL PHYSICAL PRODUCT The change in the quantity of total physical product resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal physical product, usually abbreviated MPP, is found by dividing the change in total physical product by the change in the variable input. Marginal physical product, which more often goes by the name marginal product (MP), is one of two measures derived from total physical product. The other is average physical product.
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YELLOW CHIPPEROON
[What's This?]
Today, you are likely to spend a great deal of time browsing about a thrift store looking to buy either a black duffle bag with velcro closures or any book written by Isaac Asimov. Be on the lookout for letters from the Internal Revenue Service.
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This isn't me! What am I?
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Lombard Street is London's equivalent of New York's Wall Street.
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"It has been my philosophy of life that difficulties vanish when faced boldly. " -- Isaac Asimov
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JLE
Journal of Law and Economics
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