20. If the labor unions lose memberships and become less popular, then: A) production costs will increase, SRAS will shift to the left, decreasing equilibrium GDP and increasing the aggregate price level. B) production costs will fall, there will be a downward movement along SRAS, equilibrium GDP will increase and aggregate price level will fall. C) production costs will not change, AD will shift to the right, increasing equilibrium GDP and aggregate price level. D) production costs will fall, SRAS will shift to the right, increasing equilibrium GDP and lowering the aggregate price level.