What date is known as Black Monday, the day global stock markets crashed in 1987?

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

The Dow Jones Industrial Average fell 508 points that day, a decline of 22.6 percent. It was the largest one-day percentage fall in the Dow's history, exceeding the percentage losses recorded during the Wall Street Crash of 1929. Markets in other countries also dropped sharply, making the event international rather than solely American.

Several factors were blamed, including rising interest rates, a widening U.S. trade deficit, investor fears about overvalued shares, and the rapid growth of computerized program trading. Portfolio insurance strategies could automatically generate sell orders as prices fell, intensifying the downward movement.

Black Monday is sometimes confused with Black Monday in other financial contexts, including the 1929 crash dates. The 1987 crash did not produce a depression like the 1930s collapse; coordinated action by central banks and market reforms helped stabilize financial markets afterward.