Consider a simple Keynesian income-spending model of an economy described by the following equations
C = 210 + 0.75Yd
I= 300
G= 425
TR= 120
T= 100
M = 0.15Y
X= 220
(a) Calculate the equilibrium level of income. Sketch this equilibrium position using a two-dimensional graph.
(b) Suppose the government reduces public expenditure by 50. Estimate the change in the equilibrium level of income? What is the new equilibrium level of income?