中等econ-u06-d03
Aggregate demand is C + I + G + (X - M). If imports rise while the other components are unchanged:
A. Net exports and aggregate demand fall✓ 答案
B. Aggregate demand rises by the same amount as imports
C. Aggregate demand is unchanged because imports are domestic spending
D. Government spending must rise to offset it
解說
Imports are a leakage: they are spending on foreign output, so they are subtracted from domestic aggregate demand. The M in the identity is why C + I + G + X - M is not simply domestic spending.