Today was the greatest crash in Wall Street history by one measure and took down many other milestones. The Dow plunged 2,012 points in its largest single-session drop on record! Percentage-wise, it was down 7.8%, which still knocked out decades of lows, leading to "Black Monday" being the hot search term on Google today as people sought a comparison worthy of this Monday crash.
For comparison, the 1929 event looked like this:
The stock market crash of 1929 - considered the worst economic event in world history - began on Thursday, October 24, 1929, with