乘數理論 - 經濟

來源: 96 成大企研

科目: 經濟學

問題: How will an increase in the government budget surplus as a result of
lower government spending (with no change in net taxes) affect private
saving in the economy?
(A) Private saving will be unaffected by the amount of increase in the
budget surplus.
(B) Private saving will increase by the amount of increase in the budget
surplus.
(C) Private saving will decrease by the amount of increase in the budget
surplus.
(D) Private saving will decrease by less than the amount of increase in
the budget surplus.

我的想法: 答案是D.

我不確定為什麼要選D. 我自己的想法是當G減少,

透過乘數會使得Y=C+I+G+NX減少,

dY/dG = 1/[1-b(1-r-t)-e+m], 其中 0<b,r,t,e,m<1 為誘發性項目係數

又MPS = dS/dY = 1-b

所以 dS/dG = (1-b)/[1-b(1-t)-e+m] < 1

所以答案選D~@@

但是如果是最簡單的凱因斯模型, 沒有r,t,e,m, 那 dS/dG = 1

答案就變成C~@@

還是說不能這樣子判斷~~~

請大家幫忙看一下~

謝謝!!


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