Answer:
a. Increase in Net Exports, Increase in AD, real GDP will stay same
b. Excess Demand
c. Appropriate Contractionary Fiscal Policy : decrease tax & or increase government expenditure
d. Actions smooth business cycle by brining actual real GDP towards full employment
Step-by-step explanation:
Aggregate Demand is the total value of goods & services all the sectors of an economy are planning to buy during a given period of time
Aggregate Demand [AD] = Consumption [C] + Investment [I] + Government Expenditure [G] + Net Exports [NX = Exports (X) - Imports (M)]
Aggregate Demand > Aggregate Supply at full employment level is Excess Demand. Aggregate Demand < Aggregate Supply at full employment level is Deficit Demand
Decrease in Investment leads to fall in Aggregate Demand. It creates Deficit Demand & decreases real GDP. It can be corrected through demand expansionary fiscal policy of decreasing taxes & increasing govt. expenditure.
Increase in exports leads to increase in net exports & in turn increase in aggregate demand. This causes Excess demand problem & real GDP will remain same (economy already at full equilibrium, GDP cant be increased more). Appropriate Fiscal Policy [Contractionary Fiscal Policy] includes decreasing taxes & or increasing govt. purchase.
These actions will smooth out business cycle by bringing actual real GDP back to full employment level.