NO.PZ2016010802000094
问题如下：
Equality between aggregate expenditure and aggregate output implies that the government’s fiscal deficit must equal:
选项：
A.Private saving – Investment –Net exports.
B.Private saving – Investment + Net exports.
C.Investment – Private saving + Net exports.
解释：
A is correct.
The fundamental relationship among saving, investment, the fiscal balance, and the trade balance is S = I + (G – T) + (X – M). This form of the relationship shows that private saving must fund investment expenditures, the government fiscal balance, and net exports (= net capital outflows). Rearranging gives G – T = (S – I) – X – M). The government’s fiscal deficit (G – T) must be equal to the private sector’s saving/investment balance (S – I) minus net exports.
考点： 支出法与收入法
解析：一国GDP可以通过支出法表示 Y=C+I+G+X-M，也可以通过收入法表示 Y=C+S+T ，将上述两者联立，可得： G-T=S-I-NX
老师您好，公式推导可以理解，想请教一下如何理解这个公式。
G – T = (S – I) – （X – M)
财政赤字 = 私人部门净储蓄 - 净出口。
我的理解是：
财政赤字：政府花的钱
私人部门净储蓄：国内 私人部门赚的钱
净出口：海外 私人部门赚的钱
如果“政府花的钱（财政赤字）=经济体赚的钱”的话，那可以得出“ 财政赤字 = 国内储蓄 +国外赚的钱” ，这样理解的话，符号不一致了。
请问老师我的思维哪里出错了，谢谢老师！
