Answer: d. inflationary; decrease government purchases or increase taxes
Step-by-step explanation:
Suppose Real GDP is $700 billion and Natural Real GDP is $620 billion. To eliminate this inflationary gap, Keynesian theory indicates that government should decrease government purchases or increase taxes.
The Real GDP is greater than the Natural real GDP which is the potential GDP. When that happens the Economy is said to be overheated and producing above its limits as Aggregate Demand is above Aggregate Supply.
To combat this the Government according to Keynes should embark on policy that will reduce economic activity. The Government can use Contractionary Fiscal Policy that will see it reduce its spending and/or increase taxes. Both of these will have the effect of reducing the amount of money in the economy left for both investment and consumption and cause a fall in the Aggregate Demand.