Answer:
a decrease in the currency-deposit ratio causes the M1 money multiplier to​ DECREASE and the money supply to​ DECREASE.
Explanation:
The currency-deposit ratio measures how much currency the banks' clients hold in the banks. A decrease in the currency-deposit ratio will always decrease the money multiplier because banks will hold less money. Inversely, an increase in the currency-deposit ratio will increase the money multiplier. Â
Banks "create" money when they receive deposits and then lend them to other clients, but if the amount of deposits decreases, the bank's money creating capacity decreases.