Readers Question: What do you think would happen if all depositors of a bank requested their deposits?
The Banking would probably collapse – unless it could secure unlimited funding from a Central Bank or other banks.
If a bank has deposits of £10billion. The bank will keep perhaps 1% in liquid assets (i.e. cash that can quickly be given to customers who demand it. Therefore, out of £10 billion, the bank will have cash reserves of say £100million. We say it has a liquidity ratio of 1%. Therefore, if customers asked for £100 million to be withdrawn the bank could do it. However, once customers require more cash, it faces a problem – The bank doesn’t have the deposits in a liquid form.
What banks do is they lend out deposits to other people. This is how they make a profit. They pay you 2% a year to save money, then lend to someone else and charge 7%. They can do this because usually people don’t want to suddenly withdraw all their money and it is more profitable than simply keeping money behind the counter.