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MARGINAL-COST PRICING: A pricing scheme in which the price received by a firm is set equal to the marginal cost of production. This is not only the efficient outcome achieved by competitive markets, it is commonly used for comparison of other regulatory policies, such as average-cost pricing, that are used for public utilities (especially those that are natural monopolies). The bad thing about marginal-cost pricing for natural monopolies is that a normal profit is not guaranteed. The good thing about marginal-cost pricing is that marginal cost is equal to price, and the public utility is operating according to the price equals marginal cost (P = MC) rule of efficiency.

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SAVING-INVESTMENT MODEL

A variation of the Keynesian injections-leakages model that includes the two private sectors, the household sector and the business sector. This variation, more formally termed the two-sector injections-leakages model, captures the interaction between induced saving (and indirectly induced consumption expenditures) and autonomous investment expenditures. This model provides an alternative to the two-sector aggregate expenditures (Keynesian cross) analysis of the macroeconomy, including equilibrium, disequilibrium, and the multiplier. Equilibrium is identified as the intersection between the saving line and the investment line. Two related variations are the three-sector injections-leakages model and the four-sector injections-leakages model.

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