FILE PHOTO: A man walks past the Federal Reserve in Washington, December 16, 2015. The U.S. central bank is widely expected on Wednesday to hike its key federal funds rate by a modest 0.25 percent. It would be the first tightening in more than nine years and a big step on the tricky path of returning monetary policy to a more normal footing after aggressive bond-buying and near-zero borrowing costs. REUTERS/Kevin Lamarque/File Photo