You need millions of mugs to lend you the money at 0.1%p.a, then you lend it out at 5-7%p.a. (the Natwest model).
Strangely i was wondering the same thing the other day. Proves warped minds think alike, methinks.
Establishing customer confidence is the tricky part, as always. Also, how do you then go about issuing debit cards etc, what are the rules? And who makes them?
Annual income twenty pounds, annual expenditure nineteen nineteen and six, result happiness. Annual income twenty pounds, annual expenditure twenty pounds ought and six, result misery