Answer:
To reach full employment (reduce inflationary gap), government spending must fall by $8 million.
Step-by-step explanation:
Multiplier = 1 / (1 - mpc) = 1 / (1 - 0.8) = 5
Output gap = Current GDP - Potential GDP = $100 - $60 = $40 million
Amount of change in government expenditure needed = Output gap / mpc = $40 / 5 = $8 million
Since the Potential GDP is less than the Current GDP, this implies that the government spending must fall by $8 million to reach full employment.
Therefore, to reach full employment (reduce inflationary gap), government spending must fall by $8 million.