19 Oct 1987
Stock markets have the largest-ever one-day crash on "Black Monday" The largest-ever one-day percentage decline in the Dow Jones Industrial Average comes not in 1929 but on October 19, 1987. As a number of unrelated events conspired to tank global markets, the Dow dropped 508 points—22.6 percent—in a panic that foreshadowed larger systemic issues.
