The 1987 stock-market crash that caused the Dow Jones Industrial Average to lose 22.6% in one day was Black Monday.
The crash occurred on October 19, 1987, when markets around the world fell sharply. The Dow dropped 508 points, the largest one-day percentage decline in its history. Hong Kong and European markets had already suffered major losses, and selling then spread to the United States.
Several factors were discussed afterward, including rising interest rates, concerns about trade deficits, portfolio insurance, and computerized selling strategies. No single explanation completely accounts for the speed and scale of the collapse.
The 1987 crash differed from 1929 in an important way: the United States economy did not enter a depression afterward. Regulators later introduced circuit breakers, which can temporarily halt trading during unusually rapid market declines.