A late-afternoon rally on Wall Street helped stocks close higher Friday, though the major indexes still wound up finishing lower for the week after several days of bumpy trading. The S&P 500 rose 0.5% after wavering between small gains and losses for much of the day. The Dow Jones Industrial Average rose 0.6% and the Nasdaq composite ended essentially flat after swinging between a 1% gain and an 0.8% drop.
