Janet Yellen Delivers Semi-Annual Testimony To Senate Banking Committee

Janet Yellen, chair of the U.S. Federal Reserve, center, arrives to a Senate Banking Committee hearing with Senator Richard Shelby, a Republican from Alabama and chairman of the Senate Banking Committee, right, and Senator Sherrod Brown, a Democrat from Ohio, in Washington, D.C., U.S., on Tuesday, Feb. 24, 2015. Yellen said inflation and wage growth remain too low even as the job market improves, and she signaled that a change in the Fed's guidance on interest rates won't lock it into a timetable for tightening. Photographer: Andrew Harrer/Bloomberg via Getty Images