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MARGINAL PROPENSITY TO INVEST: The proportion of each additional dollar of national income that is used for investment expenditures. Or alternatively, this is the change in investment expenditures due to a change in national income. Abbreviated MPI, the marginal propensity to invest is the slope of the investment line used in the analysis of Keynesian economics. As such, it also plays a role in the slope of the aggregate expenditure line and the multiplier effect.
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AVERAGE TOTAL COST Total cost per unit of output, found by dividing total cost by the quantity of output. When compared with price (per unit revenue), average total cost (ATC) indicates the per unit profitability of a profit-maximizing firm. Average total cost is one of three average cost concepts important to short-run production analysis. The other two are average fixed cost and average variable cost. A related concept is marginal cost.
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PURPLE SMARPHIN
[What's This?]
Today, you are likely to spend a great deal of time driving to a factory outlet seeking to buy either a wall poster commemorating next Thursday or a pair of gray heavy duty boot socks. Be on the lookout for crowded shopping malls.
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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
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"We must be willing to let go of the life we have planned, so as to have the life that is waiting for us. " -- E. M. Forster, writer
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IJIO
International Journal of Industrial Organization
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