U.S. stocks edge lower as nonfarm productivity slips

Wall Street was pressured earlier in the day due to a persistent 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 in wages and inflation. "Based on the mission's macroeconomic forecast, and barring upside surprises to growth and inflation, this would put lift-off into the first half of 2016," the fund said.