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FALLACY OF COMPOSITION: The logical fallacy of arguing that what is true for the parts is also true for the whole. In the study of economics, this takes the form of assuming that what works for parts of the economy, such as households or businesses also works for the aggregate, or macroeconomy. The contrasting fallacy, which you might want to examine next, is the fallacy of division.

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MARGINAL PROPENSITY TO INVEST

The change in business investment expenditures induced by a change in income or production (national income or gross domestic product). The marginal propensity to invest (abbreviated MPI) is another term for the slope of the investment line and is calculated as the change in investment divided by the change in income or production. The MPI plays a role in Keynesian economics. It augments the slope of the aggregate expenditures line and is part to the multiplier process. A related marginal measure is the marginal propensity to consume.

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Today, you are likely to spend a great deal of time at a garage sale hoping to buy either a wall poster commemorating yesterday or pink cotton balls. Be on the lookout for rusty deck screws.
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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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