The equilibrium condition Y = C + I^p + G + NX can be reinterpreted as follows. First, subtract C from both sides to get Y − C = I^p + G + NX. Then note that all income not spent on consumption goods is either taxed or saved, so that Y − C = S + T. Now combine the two equations to obtain S + T = I^p + G + NX. Construct a diagram with real GDP measured on the horizontal axis. Draw two lines, one for S + T and the other for I^p + G + NX. How would you interpret the point where the two lines cross? What would happen if investment spending increased?