On what date did Black Monday cause the 1987 global stock-market crash?

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

On that day, the Dow Jones Industrial Average plunged 508 points, or 22.6%, then the largest one-day percentage decline in the index’s history. Major markets in Europe, Asia, Australia, and North America also suffered dramatic losses, making the event global rather than solely American.

Several factors were associated with the crash, including high equity valuations, concerns about interest rates and trade deficits, and portfolio insurance strategies that automatically sold futures as prices fell. Those automated and program-based trades may have intensified the downward movement, although no single explanation accounts for every market’s behavior.

Black Monday is sometimes confused with the Wall Street Crash of 1929, whose most famous day was October 29, 1929. The 1987 event was different: it was a sudden worldwide market collapse followed by a relatively quick recovery in the U.S. economy and stock market.