Who owns the money in your bank account? That small question has profound implications. According to a survey by Ipsos MORI, more than 70% of people in the UK believe that when they deposit money with the bank, it is theirs-but it is not. Money deposited in a bank account is, as established under case law going back more than 200 years, legally the property of the bank, rather than the account holder. Were any hon. Members to deposit £100 at their bank this afternoon or, rather improbably, if the Independent Parliamentary Standards Authority was to manage to do so on any Member's behalf, the bank would then be free to lend on approximately £97 of it. Even under the new capital ratio requirements, the bank could lend on more than 90% of what one deposited. Indeed, bank A could then lend on £97 of the initial £100 deposit to another bank-bank B-which could then lend on 97% of the value. The lending would go round and round until, as we saw at the height of the credit boom, for every £1 deposited banks would have piled up more than £40 of accumulated credit of one form or another.
Reference
http://www.publications.parliament.uk/pa/cm201011/cmhansrd/cm100915/debtext/100915-0002.htm