The first sharp pullback for U.S. stocks in half a year is leaving investors wondering whether to buy the dip or hold out for more declines. Following several turbulent weeks, the S&P 500 is down more than 5% from its March 28 closing high, its biggest retreat since October. Many market participants believe the factors that drove the S&P 500 to a 10% gain in the first quarter - including resilient economic growth and excitement over artificial intelligence - remain in place and will support stocks over the long term.