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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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MARGINAL REVENUE CURVE

A curve that graphically represents the relation between the marginal revenue received by a firm for selling its output and the quantity of output sold. A firm maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve. The marginal revenue curve for a firm with no market control is horizontal. The marginal revenue curve for a firm with market control is negatively sloped and lies below the average revenue curve.

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