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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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AGGREGATE MARKET

An economic model relating the price level and real production that is used to analyze business cycles, gross production, unemployment, inflation, stabilization policies, and related macroeconomic phenomena. The aggregate market, inspired by the standard market model, but adapted to the macroeconomy, captures the interaction between aggregate demand (the buyers) and short-run and long-run aggregate supply (the sellers). Also known by the names AS-AD model or income-price model, the aggregate market is THE cornerstone model of macroeconomic analysis.

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Today, you are likely to spend a great deal of time searching for rummage sales trying to buy either several magazines on home repairs or a remote controlled sports car with an air spoiler. Be on the lookout for door-to-door salesmen.
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Much of the $15 million used by the United States to finance the Louisiana Purchase from France was borrowed from European banks.
"I believe that every right implies a responsibility, every opportunity, an obligation, every possession, a duty. "

-- John D. Rockefeller, industrialist

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