A. people have insufficient money balanceshave insufficient money balances and​ thus, aggregate demand decreasesdecreases.
b. interest rates increaseincrease causing planned investment to decreasedecrease​, which causes a decreasea decrease in aggregate demand.
c. people spend excess money balancesspend excess money balances and thus aggregate demand increasesincreases.
d. interest rates decreasedecrease​, causing planned investment to increaseincrease​, which causes an increasean increase in aggregate demand.
e. there is no indirect effect of the money supply on the economy.