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The marginal propensity to save (MPS) is the fraction of an increase in income that is not spent on an increase in consumption. That is, the marginal propensity to save is the proportion of each additional dollar of household income that is used for saving. It is the slope of the line plotting saving against income.〔Blanchard, O. (2006). Macroeconomics. (Fourth ed., p. 59). Pearson Education Inc.〕 For example, if a household earns one extra dollar, and the marginal propensity to save is 0.35, then of that dollar, the household will spend 65 cents and save 35 cents. Likewise, it is the fractional decrease in saving that results from a decrease in income. The MPS plays a central role in Keynesian economics as it quantifies the saving-income relation, which is the flip side of the consumption-income relation, and according to Keynes it reflects the fundamental psychological law. The marginal propensity to save is also a key variable in determining the value of the multiplier. ==Calculation of MPS== MPS can be calculated as the change in savings divided by the change in income. : Or mathematically, the marginal propensity to save (MPS) function is expressed as the derivative of the savings (S) function with respect to disposable income (Y). : where, dS=Change in Savings and dY=Change in income. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Marginal propensity to save」の詳細全文を読む スポンサード リンク
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