Stocks slumped today until the announcement of the Federal Reserve’s plans to buy billions in Treasuries and mortgage-backed securities, which caused a minor rally in equities, the Wall Street Journal reports. Treasury prices surged and yields plummeted. The Dow gained 90.88 to close at 7,486.58. The Nasdaq rose 29.11, closing at 1,491.22, and the S&P 500 rose 16.23 to settle at 794.35. (More Dow Jones stories.)