FRB low interest rates is like a perpetually open discount window for the banks to fund their operations with. If US Banks were healthy they would fund their own operations with higher rates, and the FRB would no longer have to support the US Banking System daily funding requirements, with low interest rates, and the carry trade. When will US Banks be able to stand on their own two feet again? Is the question Bernake needs to be asked. Banks are not healthly until the FRB rasies interest rates. Witness Japanese Banking for the last 20 years. BOJ low rates unhealthy japanese banks. It is just that fee simple.