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
你好老师，想问一下G-T=S-I-X+M，为什么答案是减去net exports呢，为什么最后的-X+M是net exports呢，谢谢
