What was the nickname for the sharp global stock-market fall on 19 October 1987?

The sharp global stock-market fall on 19 October 1987 was nicknamed Black Monday.

The Dow Jones Industrial Average fell 508.00 points, or 22.6%, in one U.S. trading session. That percentage drop remains the largest one-day percentage decline in the Dow's history. Markets in other countries also fell sharply, making the event global rather than solely American.

Several factors contributed, including high valuations, investor concern about interest rates and trade deficits, portfolio insurance, and computerized trading. The crash was not simply caused by one company or one piece of news. Regulators later introduced circuit breakers and other safeguards intended to slow extreme declines.

Black Monday is often confused with the 1929 crash days called Black Thursday and Black Tuesday. It also differs from the 1987 market decline as a whole: the nickname specifically identifies 19 October, although prices continued moving dramatically afterward.