Final answer:
Depositing $100 in a bank account can potentially increase the money supply by up to $1,000 through the fractional-reserve banking system, as banks will keep 10% and lend out 90% of deposits repeatedly.
Step-by-step explanation:
Assume that the required reserve ratio is 10 percent, banks keep no excess reserves and borrowers deposit all loans made by banks. If you deposit $100 into your checking account, the money supply can increase by a maximum amount due to the money creation process of the banking system. Since the required reserve ratio is 10%, this means the bank can lend out 90% of deposits, or $90, in this case. However, when these $90 are deposited in a second bank, that bank will then lend out 90% of $90, which is $81, and so on. This process can continue repeatedly, effectively creating a maximum increase in the total money supply of $1,000, as the initial $100 deposit can undergo multiple rounds of lending and depositing, with each bank retaining 10% in reserves.