
Concept Introduction:
Marginal Propensity to Consume (MPC): It is the proportion of amount which the consumer pays for consumption of goods and services, and it does not include the savings of the consumer.
Formula to calculate money multiplier:
Here:
- MPC in marginal propensity to consume.
Formula to calculate recessionary/inflationary gap:
Negative value shows inflationary gap whereas positive value shows recessionary gap.
Formula to calculate required change in government purchases:
Formula to calculate transfer per dollar:
Here:
- MPC in marginal propensity to consume.
Formula to calculate change in the government transfers:
a. Change in government spending and government transfer.
Given:
Real
Potential output equals $160 billion.
Marginal propensity to consume is 0.75.
Substitute 0.75 for MPC in (I):
Substitute $160 billion for potential output and $100 billion for real output in (II):
Substitute $60 billion for recessionary gap and 4 for money multiplier in (III):
Substitute 0.75 for MPC in (IV):
Substitute $60 billion for recessionary gap and $3 for transfer per dollar in (V):
Therefore, there is a rise in government spending by $15 billion and there should be increase in government transfers by $20 billion.

Explanation of Solution
Conclusion:
Thus, rise in government spending is by $15 billion and government transfers by $20 billion.
b. Effect on Real GDP when MPC is 0.5.
Given:
Real GDP equals $250 billion.
Potential output equals $200 billion.
Marginal propensity to consume is 0.5.
Substitute 0.75 for MPC in (I):
Substitute $160 billion for potential output and $100 billion for real output in (II):
Substitute $60 billion for recessionary gap and 4 for money multiplier in (III):
Substitute 0.75 for MPC in (IV):
Substitute $60 billion for recessionary gap and $3 for transfer per dollar in (V):
Therefore, there is a fall in real GDP by $50 billion and there should be a decrease in government transfers by $25 billion.
Conclusion:
Thus, a fall in real GDP by $50 billion and decrease in government transfers by $25 billion.
c. Effect on Real GDP when MPC is 0.8.
Given:
Real GDP equals to $180 billion.
Potential output equals to $100 billion.
Marginal propensity to consume is 0.8.
Substitute 0.8 for MPC in (I):
Substitute $100 billion for potential output and $180 billion for real output in (II):
Substitute $80 billion for recessionary gap and 5 for money multiplier in (III):
Substitute 0.8 for MPC in (IV):
Substitute $80 billion for recessionary gap and $4 for transfer per dollar in (V):
Therefore, there is a fall in real GDP by $80 billion and there should be a decrease in government transfers by $20 billion.
Conclusion:
Thus, there is a a fall in real GDP by $80 billion and a decrease in government transfers by $20 billion.
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