I would draw the line at being 100% reserved.

You could currently be fully reserved by either renting vault space and keeping your cash or other valuables there. I think there are already repositories of gold which will hold your gold for you and for which people can trade (if they want to) warehouse receipts for the gold rather than having to constantly go and get it and move the gold around physically.

You could also on a smaller scale (I guess) rent safety deposit boxes and keep your cash there.

It is hard to believe anybody stops someone from setting up a business where they would hold your money in vaults and provide you a certain level of protection for a fee. The fact that neither of us has ever tried to find such a service in the united states probably means that not only is there essentially no demand for such a "bank," but that even we don't really want such a thing.

R: