Stocks fell in light volume Friday, led by Amazon’s 10% plunge following a weaker-than-expected earnings report. The Dow Jones industrial average lost 0.7%, sinking below 17,000, as Visa (V) fell nearly 4% after a mixed earnings report. The Nasdaq and the S&P 500 dropped 0.5% each. Volume fell 12% on the Nasdaq and 14% on the NYSE, according to preliminary data.