Two things drive the market; fear and greed. Right now fear has taken over. The market opened up this morning with a sell off of over 1,000 pts. As the market declines some investors see that as a buying opportunity and the market rises. I have been in the market for well over 20 years and have never seen it tank that many points ever. Last week the market lost ground as well. The yen is rising against the dollar. China's economy is tanking; several markets across the globe got hit...things are not good.
Greed was the reason it was/is so over inflated NOW. Fear is the reason it is crashing now.
The market is being run by low to zero interest rates for one thing. No place to put money other then the stock market so it will fluctuate aimlessly.
I have been saying for more then a year the crash is coming, whether this is it or not who knows. It's all paper money, no cash to back anything, it's way over inflated. With interest rates so low and being 19 trillion in debt the guvmit can do nothing to stop it this time like in the past. Biggest problem is the LOW to non existent interest rates!