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SCARCE RESOURCE: A resource with an available quantity less than its desired use. Scarce resources are also called factors of production. Scarce goods are also termed economic goods. Scarce resources are used to produce scarce goods. Like the more general society-wide condition of scarcity, a given resource is scarce because it has a limited availability in combination with a greater (potentially unlimited) productive use. It's both of these that make it scarce. In other words, even though an item is quite limited it will not be a scarce resource if it has few if any uses (think pocket lint and free good).

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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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