Consider a simple economy in which investment is constant and equal to $100 billion. There is no government or foreign sector, and the price level is constant. Consumption is
C = $40 billion + 0.75Y.
a. What is the value of the marginal propensity to consume?
b. What is consumption at an output of $1,000 billion?
c. What is the equilibrium GDP in this model?
d. What is the value of the multiplier?
e. What happens to equilibrium GDP should investment demand fall to $80 billion?