Mr float said...
is this idea a potential election winner?
No, no it's not.
There are already many choices out there.
What makes you say that there's a virtual monopoly? There's nothing to stop any of the smaller competitors growing to join the big 4. There is no bar to competition.
For example telstra owns all the copper lines, so it has a competitive advantage (Pre NBN) that can never be matched.
With the banks the only thing the smaller ones can't match is a/ advertising budget and b/ security. Security is
only an issue if the sky falls in and ignorant chicken littles all rush the bank trying to withdraw their money at once.
The credit union that is my main bank, and has been for 15 years, exists only to provide a service. Not to make a profit. It charges and pays interest at whatever rate allows it to remain operating and marginally in the profit. I can't see how this could possibly be different to your idea unless the government was actively injecting money, which would defeat the purpose.
If you want to do something, go to a non big 4 bank and join there. It's simple. If every customer did that, they wouldn't be the 'big' 4 any more, would they? They'd be the 'we're going broke because we have no customers' 4.