Assume there is a fall investment spending caused by a pessimistic outlook on the regulatory environment. How does the AD curve change? If the MPC=.60 what is the size of the shift in the AD?
If the Congress wants to use fiscal policy in this situation, how should it act? Will there be crowding out in this case?
Lower investment spending will decrease aggregate demand, shifting the AD curve leftward.
If MPC = 0.6, Multiplier = 1 / (1 - MPC) = 1 / (1 - 0.6) = 1 / 0.4 = 2.5
Therefore,
Magnitude of rightward shift in AD = Amount of decrease in investment spending x 2.5
A fall in AD has to be countered by expansionary fiscal policy to stimulate aggregate demand, which can be done by increasing government spending and/or decreasing tax. If government spending is increased, it will lead to higher budget deficit (or lower budget surplus), to finance which, government will resort to borrowing. Higher borrowing will increase interest rate, dampening investment demand which will crowd out the increase in AD caused by higher government spending.
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