The business cycle occurs because a. potential gdp is increasing, and increases in aggregate demand cannot keep pace with increases in long-run aggregate supply b. the government is constantly trying to produce an inflationary gap, but expenditures in the economy cannot keep pace with the government's agenda c. aggregate demand and short-run aggregate supply fluctuate, but the money wage rate does not adjust quickly enough to keep real gdp at potential gdp d. the fed is constantly increasing the quantity of money