First, suppose the United States economy is represented by the following equations: Z=C+I+G, C = 300+.5YD, YD=Y-T T = 400, I = 250, G = 1000 Given the above variables, calculate the equilibrium level of output. Now assume that consumer confidence increases causing a rise in autonomous consumption (co) from 300 to 500. What is the new equilibrium level of output? How much does income change as a result of this event? What is the multiplier for this economy? Please show your calculation details.