On which date did the 1987 global stock-market crash reach its most famous one-day fall?

The 1987 global stock-market crash reached its most famous one-day fall on 19 October 1987.

That Monday became known as Black Monday. The Dow Jones Industrial Average fell 22.6 percent in a single trading session, the largest one-day percentage decline in its history. Major markets in Europe, Asia, and elsewhere also experienced severe losses, making the event genuinely global rather than solely American.

Several factors contributed, including elevated valuations, trade and interest-rate concerns, portfolio insurance, and computerized selling strategies. The precise balance among those causes remains debated, but automated selling amplified the downward movement once prices began falling.

The crash did not produce a depression comparable to the 1930s. The Federal Reserve, led by Chairman Alan Greenspan, supplied reassurance and liquidity, while markets eventually recovered. Black Monday is often confused with the 1929 Black Tuesday episode; the dates and market mechanisms were different.