Suppose the inflation rate in an economy is observed to be falling. Sketching an AS/AD model for each case, determine which of the following phenomena could be the cause. (There may be more than one.)

a. The federal government gives households a substantial tax cut

b. Agricultural harvests are particularly good this year

c. Businesses are confident about the future and are buying more equipment

d. The Fed is trying to move the economy toward a lower long-run inflation rate