Figure 33-6 aUANTlTY OF OUTPUT er to Figure 33-6. Suppose the economy starts at Z. If changes occur that move the economy to a new short-run equilibrium of P1 and Yl , then it must be the case that o B. aggregate demand has decreased. C) b. short-run aggregate supply has decreased. C) c. short-run aggregate supply has increased. C) d. aggregate demand has increased. n Key