[drinkzima]

I don't understand why you would do this when short term Treasuries or money market funds exist. There are far better solutions than what you suggest.

[ericpauley]

It really makes no sense. The bank's "cash" is really just database entries with the Fed anyway, why not loan the money to the Fed overnight (reverse repo) at 5%? The reason GP's dream doesn't exist is because MMs do effectively the same thing and pay you.