NEW YORK—Wall Street’s best week since March ran out of steam Friday as worries rose about the U.S. government’s efforts to avoid a potentially disastrous default on its debt.
The S&P 500 slipped 6.07 points, or 0.1 percent, to 4,191.98. The Dow Jones Industrial Average fell 109.28, or 0.3 percent, to 33,426.63, while the Nasdaq composite gave up 30.94, or 0.2 percent, to 12,657.90.
Despite its weak Friday, the S&P 500 still managed to break out of a long, listless stretch where it failed to move by 1 percent, up or down, for six straight weeks. It gained 1.6 percent, with much of the strength earlier in the week coming on rising hopes that Washington can avoid a debt default….