Except that the Fed is not keeping the federal funds rate low. The Fed has raised the rate twice already this year as well as once at the end of 2016. They have also signaled that another increase is coming in December. See:
http://thehill.com/policy/finance/337790-fed-raises-rates-fo...
and
https://www.nytimes.com/2017/09/20/business/economy/fed-bond...