Joseph Ciolli

Trader Gregory Rowe works on the floor of the New York Stock Exchange, Wednesday, Aug. 26, 2015. U.S. stocks closed sharply higher, giving the stock market its best day in close to four years. The Dow Jones industrial average climbed 619 points, or 4 percent on Wednesday. (AP Photo/Richard Drew)

Big day of relief from market heartburn

Two things that have supported U.S. stocks in the past — dovish words from the Federal Reserve and improving economic data — on Wednesday triggered...