There have been two market panics in the last year and neither has a simple explanation
Selling, at some point, becomes a self-reinforcing activity.
You can point to China or the Fed for this kind of market move but over the past 5 days there has been virtually zero critical new information coming into markets.
History has shown that a panic can hit at almost any time but for there to be sustained selling, you eventually need a reason. I don't see that reason.
