If investment decreases by $20 billion and the economy's MPC is .5, the aggregate demand curve will shift:

A. leftward by $40 billion at each price level.
B. rightward by $20 billion at each price level.
C. rightward by $40 billion at each price level.
D. leftward by $20 billion at each price level.


A. leftward by $40 billion at each price level.

Economics

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