Stocks fell Monday in light, pre-holiday trading, extending Friday's losses. The Dow Jones industrial average lost 0.4%. The Nasdaq fell 0.3% and the S&P 500 slipped 0.2%. Volume tumbled across the board due to the half-session. High-volume movers were few, but Herbalife (HLF) tumbled 5% in more than five times average trade, as it extended last week's nose-dive. The network marketer of nutrition supplements and personal care products, plunged 38%