Answer:
a.increase spending by $100 billion.
Step-by-step explanation:
For computing the effect, first we have to find out the multiplier then, the spending amount effect which is shown below:
Government spending multiplier = 1 ÷ (1 - marginal propensity to consume)
Government spending multiplier = 1 ÷ (1 - 0.90)
Government spending multiplier = 1 ÷ 0.10
So, Government spending multiplier = 10
Now the effect of spending would be
= Output level at full employment ÷ Government spending multiplier
= $1,000 billion ÷ 10
= $100 billion increase