What was the nickname of the 19 October 1987 global stock-market collapse?

The 19 October 1987 global stock-market collapse was nicknamed Black Monday.

On that Monday, the Dow Jones Industrial Average fell 508 points, or 22.6%, in its largest one-day percentage decline. Major markets in Europe, Asia, and elsewhere also dropped sharply, making the event an international crash rather than a problem confined to New York.

Several pressures were involved, including rising interest rates, concerns about economic growth, and trade tensions. Computerized trading strategies and portfolio-insurance systems also amplified selling once prices began to fall. The exact balance among these causes remains a subject of financial history.

Black Monday is often confused with the 1929 crash days, which had different nicknames. Despite the dramatic fall, the United States economy did not enter a depression like that of the 1930s. Market reforms followed, including coordinated mechanisms intended to pause trading during extreme declines.