Wall St slips as US productivity falls, bond rout eases

U.S. stocks added to their losses in early afternoon trading on Thursday after data showed U.S. nonfarm productivity fell sharply and investors digested the International Monetary Fund's comment urging the Federal Reserve to delay a rate hike. Wall Street was pressured earlier in the day due to a selloff in the global bond market after the ECB said that investors should get used to volatility in the market. The IMF said the Fed should not raise rates until there are clear signs of a pickup