On Thursday, Federal Reserve Vice Chairman Stanley Fischer announced the Fed will likely start raising interest rates around the middle of next year. The Fed has kept rates near zero since 2008 and has nearly quadrupled its balance sheet to more than $4 trillion through a series of bond purchase programs in an effort to push borrowing costs down further and boost hiring. The Fed is expected to wrap up its bond buying program later this month. Minutes of the Fed’s September policy meeting, released on Wednesday, showed several officials worried that troubling global growth and a stronger dollar could undercut the U.S. recovery.