argues that? A. aggregate demand is unstable because of arbitrary changes in consumer and investment spending
B. Aggregate demand is unstable because of unexpected changes in government purchases
C. government shouldn't use fiscal policy to offset private changes in aggregate demand
D. aggregate demand isn't influenced by waves of pessimism and optimism
B. Aggregate demand is unstable because of unexpected changes in government purchases
C. government shouldn't use fiscal policy to offset private changes in aggregate demand
D. aggregate demand isn't influenced by waves of pessimism and optimism