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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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MACROECONOMIC MARKETS

Three sets of markets that make up the macroeconomy--product, financial, and resource--which exchange the three primary types of macroeconomic commodities--gross production, legal claims, and factor services. The four macroeconomic sectors--household, business, government, and foreign--interact through these three sets of markets. The primary objective of macroeconomic theories is to explain activity that takes place in these three sets of markets.

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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites trying to buy either car battery jumper cables or a dozen high trajectory optic orange golf 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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