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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 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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Today, you are likely to spend a great deal of time watching the shopping channel looking to buy either a desktop calendar with all federal and state holidays highlighted or a half-dozen helium filled balloons. Be on the lookout for mail order catalogs with hidden messages.
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Ragnar Frisch and Jan Tinbergen were the 1st Nobel Prize winners in Economics in 1969.
"Good humor is a tonic for mind and body. It is the best antidote for anxiety and depression. It is a business asset. It attracts and keeps friends. It lightens human burdens. It is the direct route to serenity and contentment."

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