On what date did the global stock-market panic known as Black Monday occur in 1987?

Black Monday, the global stock-market crash of 1987, occurred on October 19, 1987.

The Dow Jones Industrial Average fell 508 points, or 22.6%, in a single session. That percentage decline remains the largest one-day percentage fall in the Dow’s history. Stock markets in other countries also suffered sharp losses, making the event an international crash rather than a problem limited to the United States.

Several factors contributed, including rising interest rates, investor concerns about trade deficits, and computerized portfolio-insurance strategies that generated more selling as prices dropped. The exact cause is therefore broader than one headline or one company failure.

Black Monday is sometimes confused with the 1929 Wall Street crash, whose best-known panic session was Black Tuesday. The two events were separated by 58 years and had very different economic settings.