The 1987 global stock-market crash’s biggest one-day trading loss was known as Black Monday.
Black Monday occurred on October 19, 1987. The Dow Jones Industrial Average lost 22.6 percent in a single session, its largest one-day percentage decline. Markets in Hong Kong, Europe, Australia, and other regions also fell, making the event international rather than solely American.
Several explanations have been studied, including portfolio insurance, computerized trading, overvalued shares, trade tensions, and concerns about interest rates and the dollar. No single cause fully explains the speed and scale of the decline. Unlike the 1929 crash, the 1987 fall was not followed by a decade-long depression in the United States.
The term Black Monday is also used for other market disasters, including October 28, 1929. The 1987 event is normally identified by its year or by the Dow’s record percentage fall.