Federal Reserve Chair Janet Yellen speaks at an economics conference, …

AP | published: October 1, 2017

Federal Reserve Chair Janet Yellen speaks at an economics conference, Tuesday, Sept. 26, 2017, in Cleveland. Yellen has acknowledged that the Fed is puzzled by the persistence of unusually low inflation and that it might have to adjust the timing of its interest rate policies accordingly. (AP Photo/Dake Kang)