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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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SUPPLY INCREASE

An increase in the willingness and ability of sellers to sell a good at the existing price, illustrated by a rightward shift of the supply curve. An increase in supply is caused by a change in a supply determinant and results in an increase in equilibrium quantity and a decrease in equilibrium price. A supply increase is one of two supply shocks to the market. The other is a supply decrease.

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