cause every time I look around there's another web site that want to sell me market moving urgent stories. If they could make $ trading it , they wouldn't be selling it.
Fwiw, Schiller explains the news in "Irrational Exuberance". On the short side Imo, it's the old what came first conundrum, the chicken or the egg. Does the news drive the price or is the news after the fact? Only the shadow knows.