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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 COST OF SEARCH

The incremental cost incurred by additional search effort is the marginal cost of search. Marginal cost of search, also termed marginal search cost, is comparable to marginal cost of short-run production analysis. Marginal cost of search increases with an increase in search effort and is represented by the marginal cost of search curve. This is one half of the efficient information search decision. The other is marginal benefit of search.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers wanting to buy either a how-to book on home repairs or a large, stuffed kitty cat. Be on the lookout for a thesaurus filled with typos.
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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.
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