Thus far, we have assumed that the investment variable ̄I is independent of the level of income. In the real
world, however, this is not the case. Ignoring interest rates for now, suppose that investment is similar to
consumption: there is a baseline invested every period, b0, and increases with income at the rate b1. Assume
that b0 > 0, b1 > 0, and 0 < b1 + c1 < 1, along with the other assumptions we made during class. This
problem examines the implications of allowing investment to depend on output.
Consider the following behavioral equations:
Z = C + I + G
C = c0 + c1Yd
Yd = Y − T
I = b0 + b1Y
Question : Solve for the equilibrium (Y) in terms of exogeneous variables? Walk me through the steps please