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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 DEMAND

The total real expenditures on final goods and services produced in the domestic economy that buyers are willing and able to undertake at different price levels, during a given time period (usually a year). Aggregate demand, usually abbreviated AD, is an inverse relation between price level and aggregate expenditures. This is one half of the AS-AD (aggregate market) analysis. The other half is aggregate supply. Aggregate demand consists of four aggregate expenditures--consumption expenditures, investment expenditures, government purchases, and net exports--made by the four macroeconomic sectors--household, business, government, and foreign.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store seeking to buy either a birthday gift for your grandmother or a T-shirt commemorating yesterday. Be on the lookout for broken fingernail clippers.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
"Do not think a man has done his full duty when he has performed the work assigned him. A man will never rise if he does only this. Promotion comes from exceptional work. "

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