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SAVING FUNCTION: The positive relation between household saving and household disposable income. The saving function is commonly presented as the saving line or propensity-to-saving line. The slope of this line is the marginal propensity to save, which is the proportion of any additional income used for saving. The saving function and the marginal propensity to saving play key roles in the multiplier and accelerator concepts. Because consumption is the difference between disposable income and saving, the consumption function is a complementary relation to the saving function.

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INJECTIONS LINE

A graphical representation of the relation between the level of aggregate production and one or more injections. The three injections (non-consumption expenditures on aggregate production) are investment expenditures, government purchases and exports. The injections line sequentially adds, or layers, each of these three expenditures depending on the number of sectors used in the analysis (two, three, or four). The slope of the injections line depends on which if any of the expenditures are induced by aggregate production. The injections line is combined with the leakages line (containing saving, taxes, and imports) in the Keynesian injections-leakages model.

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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
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