By Saqib Iqbal Ahmed and Laura Matthews NEW YORK (Reuters) -The stock market's recent weakness marked a speed bump in a rally that had driven stocks to a series of record highs, but many investors view the pullback as a breather rather than a sign of deeper trouble. The S&P 500 has fallen 2.4% over the last eight sessions as investors fretted over the state of the U.S. economy and elevated valuations of artificial intelligence and technology stocks — sectors that have powered the market this year. "It's a speed bump. It's not a wall that you're going to ram the car into and have a bit more damage than anyone is planning for," said Raheel Siddiqui, senior investment strategist at Neuberger Berman Global Equity Research Department. "Whether it's something more than a simple correction, a rec

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