Wall Street found little reason to continue the gains of the previous three sessions overnight amid lukewarm US productivity data and downgrades in economic growth forecasts in Europe.
Investors also were disappointed to hear that Federal Reserve Bank of Dallas President Richard Fisher thinks there's adequate economic stimulus in place, a day after Fed Bank of Boston President Eric Rosengren argued the central bank should do more bond-buying until the economic recovery accelerates.
Fisher disagrees. "We're at the risk of overburdening the central banks," Fisher said in an interview with Bloomberg. "We keep applying what I call monetary Ritalin to the system. We all know there's a risk of over-prescribing."
The world's largest economy keeps producing lacklustre data. American nonfarm productivity increased at a 1.6 per cent annual rate between April and June, according to Labor Department data. While the increase was better than expected, it remains low.
"The pace of productivity growth is relatively soft at the moment. It's hard to add production on a faster pace without adding more workers," Jeremy Lawson, an economist at BNP Paribas in New York, told Reuters.