U.S. stocks turned lower Monday, after the Standard & Poor's 500 Index jumped to the highest level since 2008 last week and as Chinese fundamentals deteriorated, increasing worries over a slowing global economy.
"There is some apprehension as to whether or not the Fed is actually going to put something in place based on the jobs report we saw on Friday, so that has people - in general terms - on hold until they see something they can act on," said Peter Kenny, managing director at Knight Capital.