Chinanews client March 11th (Xie Yiguan) On March 11, the S & P 500 index opened down 73.10 points, or 2.54%, to 2809.10 points; the Nasdaq index opened down 197.90 points, or 2.37%, to 8146.37 points; the Dow Jones index opened down 692.30 points, or 2.77%, to 24325.91 points.