]Outgoing Federal Reserve Bank Chair Janet Yellen said on Friday that solid economic growth, faster wage increases, and a tightening labor market mean the U.S. central bank will likely to need keep raising interest rates gradually. On Saturday, she hands the reins to President Donald Trump’s pick to replace her, Governor Jerome Powell. Yellen plans to stay in Washington as a fellow at the Brookings Institution, which is the think tank where former Fed Chair Ben Bernanke also works.