Standard & Poor’s 500 Index versus Volume (200-day ma) www.ritholtz.com/blog/wp-content/uploads/2011/04/0405chart.jpg http://www.ritholtz.com/blog/2011/04/stocks-up-volume-down-2/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+TheBigPicture+(The+Big+Picture)