The S&P 500 climbed for a fifth day, adding 1 percent to 896.24 to complete its longest streak of gains since July 2007. The Dow Jones Industrial Average rallied 102.43 points, or 1.2 percent, to 8,829.04, while the Nasdaq Composite Index increased 0.2 percent to 1,535.57. Almost two stocks rose for each that fell on the New York Stock Exchange. Best Week Since ‘74 The S&P 500 surged more than 12 percent this week, its best weekly performance since 1974, as the Federal Reserve committed as much as $800 billion to help resuscitate lending markets and investors speculated President-elect Barack Obama’s economic team will bolster growth. Obama said Nov. 26 that he will implement plans to shore up the economy on “day one” of his presidency. About 787 million shares changed hands on the NYSE in the slowest trading session of the year. U.S. exchanges were shut yesterday for the Thanksgiving holiday and closed at 1 p.m. today.