I've been tracking volume on NYSE since 2007. This year, it's the lowest year since I don't know how long. It's barely keeping it's head above 1 billion shares per day, where as since 2007 at this point it should be trading over 1.5 billion. The volume has dropped by 33%. Where did this volume go, and what does that mean? Raging bull market on dropping volume... it's can't be a good sign, could it?