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TOTAL VARIABLE COST CURVE: A curve that graphically represents the relation between total variable cost incurred by a firm in the short-run production of a good or service and the quantity produced. The marginal cost curve, THE focal point for the analysis of short-run production, can be derived directly from the total variable cost curve. The shape of the total variable cost curve reflects increasing marginal returns at small quantities of output and decreasing marginal returns at later quantities.

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INJECTIONS-LEAKAGES MODEL

A macroeconomic model that balances non-consumption expenditures on production (injections) and non-consumption uses of income (leakages) that is used to identify the equilibrium level of, and analyze disruptions to, aggregate production and income. The injections-leakages model is based on the principles of Keynesian economics and provides an alternative to the standard aggregate expenditures (Keynesian cross) analysis. The three injections included in the model are investment expenditures, government purchases, and exports. The three leakages included in the model are saving, taxes, and imports. Three variations are the two-sector injections-leakages model (or saving-investment model), three-sector injections-leakages model, and four-sector injections-leakages model.

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