Wall Street flat as investors look for clues on rates

Federal Reserve Chair Janet Yellen painted a rosy picture of the U.S. economy at an economic symposium on Friday and said the case for a rate hike was strengthening, but gave little indication on when the central bank could move. Fed Vice Chairman Stanley Fischer, in an interview with Bloomberg TV on Tuesday, said the U.S. job market is close to full strength and the pace of interest rate hikes will depend on how well the economy is doing.