C = 40+0.5×(Y - T)
G=$215 billion, IP=$50 billion and T=$10 billion.
Y=C+IP+G
What is the equilibrium income level?
Suppose that government purchases are reduced by $100 billion. What is the new equilibrium level of income?
Based on the effect of the change in government purchases on equilibrium income, what is this economy's multiplier equal to?