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TAX RATE: The percent of the tax base that is collected as tax. The tax rate can be a flat, or proportional, rate, meaning it is a constant percent of the tax base regardless of the size or value of the base. Or the tax rate can change as the tax base changes. If the tax rate increases, the tax is progressive. If the tax rate decreases, the tax is regressive.

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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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