Explanation:
a. The computation is shown below:
As we know that
Multiplier = 1 ÷ 1 - MPC
1.5 = 1 ÷ 1 - MPC
So, MPC is 0.3333
Now the real GDP is
= Multiplier × Government spending
= 0.3333 × $70 billion
= $105 million
So the change in real GDP is
= $105 million - $70 million
= $35 million
b. The computation is shown below:
As we know that
Multiplier = 1 ÷ 1 - MPC
Multiplier = 1 ÷ 1 - 0.6
So, multiplier is 2.5
Now the real GDP is
= Multiplier × Government spending
= 2.5 × $16 billion
= -$40 million
c. As we know that
Real GDP = Multiplier × Government spending
$280 billion = Multiplier × $70 billion
So, the multiplier is 4
Now the MPC is
Multiplier = 1 ÷ 1 - MPC
4 = 1 ÷ 1 - MPC
So, the multiplier is 0.75