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USER CHARGE: A tax that's disguised as a price--a charge for the use of a publicly provided good. Government produces and supplies a number of near-public goods, like education, libraries, parks, and transportation systems. The "prices" for these goods are user charges. The logic is that people who benefit from the good and are willing to pay, should pay for them. While this helps pay production costs, it tends to be inefficient.

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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 flea market trying to buy either storage boxes for your summer clothes or 500 feet of coaxial cable. Be on the lookout for fairy dust that tastes like salt.
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