U.S. Federal Reserve Chair Janet L. Yellen participates in a roundtable discussion with Federal Reserve Bank of Philadelphia President Patrick Harker and members of the West Philadelphia Skills Initiative in Philadelphia, Pennsylvania, U.S., June 6, 2016. REUTERS/Charles Mostoller

U.S. Federal Reserve Chair Janet L. Yellen participates in a roundtable discussion with Federal Reserve Bank of Philadelphia President Patrick Harker and members of the West Philadelphia Skills Initiative in Philadelphia, Pennsylvania, U.S., June 6, 2016. REUTERS/Charles Mostoller

U.S. Federal Reserve Chair Janet Yellen. Photo: Reuters, Charles Mostoller

June 6, 2016 3:28 PM (UTC+8)