March 21 (Bloomberg) -- U.S. stocks posted their biggest gain in seven weeks after the Federal Reserve injected more cash into the banking system and Wall Street's largest securities firms posted earnings that topped estimates.
Goldman Sachs Group Inc., Morgan Stanley and Lehman Brothers Holdings Inc. led the largest rally in financial shares since September 2001 after their first-quarter results eased concern a cash shortage at banks will deepen. Fannie Mae and Freddie Mac jumped more than 50 percent after the biggest sources of mortgage financing agreed to expand loan purchases. Homebuilders surged.
``It could be a turning point,'' said Jeffrey Kleintop, who helps oversee about $273 billion as chief market strategist at LPL Financial in Boston. ``What we have to get confidence around is that there aren't going to be dominos, there aren't going to be a number of other firms failing.''
