
If you thought the Dow Jones Industrial Average gapping down at open Thursday, then dropping a heart-stopping 785 points, and then rallying back 709 points to close down only 79.40 points was normal, you might be right.
As abnormal as that sounds, it's not unusual for equity markets to make intraday moves like that.
And while it's not unusual, the truth about how it happens is frightening.
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