I am not a market genious, so please help me understand if I am way off base. So far, whenever I hear about the massive sell off over the last few weeks, its always followed by "market investors have lost over a trillion dollars". I thought the markets were a zero sum game??? If someone looses money, someone else gains money. If someone sold, its only because someone else bought. Whats bad for one is always good for another...so why is it portrayed as bad for everyone?