If the income multiplier is 4 and the equilibrium national income level is $5,000 . then a $20 increase in aggregate demand at every level of national income will cause
a. the aggregate demand curve to shift to the right and national income to increase by $20
b. the aggregate demand curve to shift to the left and national income to increase by $20
c. the aggregate demand curve to shift to the right and national income to increase by $80
d. the aggregate demand curve to shift to the left and national income to increase by $80
e. an $80 movement along the existing aggregate demand curve
C
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