Federal Reserve Chair Jerome Powell faces if not the most difficult challenge of his time in office at least the trickiest in his final months as head of the all-powerful U.S. central bank. Fresh off his surprisingly tough talk Wednesday on the potential for another interest rate cut in December, Powell will have to steer his way through a suddenly contentious atmosphere among policymakers that will make whichever direction the Fed chooses divisive. While it's not the existential economic