Please answer this question thank you

21. Aggregate demand will increase if 0 A. consumption falls 0 B. investment falls 0 C. export falls 0 D. import falls 22. An increase in aggregate demand will mostly inuence price if Q A. aggregate supply is perfectly inelastic O B. aggregate supply is perfectly elastic O C. aggregate supply is unitary elastic O D. aggregate demand is inelastic 23. Which of the following factors will increase aggregate demand? 0 A. An increase in saving O B. An increase in import expenditure 0 C. An increase in tax revenue 0 D. An increase in investment 24. According to the Keynesian approach, which of the following is TRUE regarding the effect of reduction in government expenditure? 0 A. Aggregate expenditure decreases, IS curve shifts to the left, and AD curve shifts to the left. 0 B. Aggregate expenditure decreases, IS curve shifts to the right, and AD curve shifts to the left. 0 0. Aggregate expenditure decreases, IS curve shifts to the left, and AD curve shifts to the right. 0 D. Aggregate expenditure increases, IS curve shifts to the left, and AD curve shifts to the left. 25. Each point on the Keynesian AD curve shows an equilibrium in the O A. money market only. O B. goods market only. O C. goods and money markets. OD. none of the alternative answers is correct. 26. Keynesian aggregate supply curve is flatter if A. price level and money wage are fixed. O B. price level and money wage are flexible. O C. price level is flexible but money wage is fixed. O D. price level is fixed but money wage is flexible. 27. A rightward shift of aggregate supply curve causes A. general price level and national income decrease. OB. general price level decreases and national income increases. O C. general price level increases and national income decreases. O D. general price level and national income increase. 28. Aggregate supply curve shifts to the left if A. expected real wage falls. B. expected price decreases. O C. level of technology increases. O D. population increases.29. An increase in consumption causes 0 A. a shift of aggregate supply curve to the right. 0 B. a shift of aggregate supply curve to the left. 0 C. a shift of aggregate demand curve to the right. 0 D. a shift of aggregate demand curve to the left. 30. Keynes believed that O A. the role of government is not important in achieving full employment level in the economy. 0 B. wage and salary are exible. O C. a competitive economy without government intervention will achieve full employment level. 0 D. high unemployment level can be addressed through scal policy