Q. How much money can banks create?

Does that mean that banks can create an unlimited amount of money? No the answer is no - it would require them to lend an unlimited amount of money and as we know that is not possible. 

Banks use deposits to create new loans though there is a significant difference between loans anddeposits. When individuals deposit money in a bank, they may withdraw the money whenever they like. A bank, conversely, has no right to cancel a loan and get their money back whenever they want to. Banks thus need reserves so that they can deal with large withdrawals. A bank with small reserves will hence be less inclined to lend money.