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In economics, a country's national savings is the sum of private and public savings. It is generally equal to a nation's income minus consumption and government purchases. == Economic model of national savings == In this simple economic model with a closed economy there are three uses for GDP, (the goods and services it produces in a year). If Y is national income (GDP), then the three uses of C consumption, I investment, and G government purchases can be expressed as: * National savings can be thought of as the amount of remaining money that is not consumed, or spent by government. In a simple model of a closed economy, anything that is not spent is assumed to be invested: * National savings should be split into private savings and public savings. A new term, T is taxes paid by consumers that goes directly to the government as shown here: * (Y - T) is disposable income. (Y - T) less consumption (C) is private savings. The term (T - G) is government revenue through taxes, minus government expenditures, which is public savings, also known as the Budget surplus. * The interest rate plays the important role of creating an equilibrium between saving and investment. In open economy model (balanced public spendings) NX = Net eXports = eXports - iMports NX = (X-M) NX=Y-(C+I+G)=Y-Domestic demand Y=C+I+G+NX = National accounts identity Y-C-G= S =I+NX ''S=I+NX = National savings'' S-I = The portion of national savings not used to finance domestic investment = NX = Trade balance In open economy model (public deficit or surplus) (1) Y = C + I + G + (X - M) = National accounts identity (2) Yd = Y - TAX + TR = Disposable income depending on aggregated demand, taxes and transfers (3) Yd = S + C = Disposable income depending on savings and consumption → (2),(3) S + C = Y - TAX + TR (4) Y = S + C + TAX – TR = Aggregated demand → (1),(4) C + I + G + (X – M) = S + C + TAX – TR '' (5) S = (X - M) - (TAX - TR – G) + I = National savings'' (S - I + (TAX - TR – G) = The portion of national savings not used to finance domestic investment and public deficit = (X - M) = Trade balance ) 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「National savings」の詳細全文を読む スポンサード リンク
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