Wall Street slips amid worries about worsening pandemic

Stocks closed broadly lower on Wall Street Friday following another choppy day of trading as worries about the worsening pandemic undercut growing optimism about a coming coronavirus vaccine. The Standard & Poor’s 500 fell 0.7%, erasing its gains from a day earlier. The benchmark index, which climbed to an all-time high on Monday, posted its first weekly decline after two weeks of gains. The index is still up 8.8% so far this month. Technology, financial and industrial companies drove much of the selling, which turned volatile in the final hour of regular trading. Treasury yields were mostly lower, a sign of caution in the market. Stock indexes around the world made modest moves. Traders...