On which date did the 1987 Wall Street Crash's “Black Monday” occur?

The 1987 Wall Street Crash’s “Black Monday” occurred on 19 October 1987. On that Monday, the Dow Jones Industrial Average fell 508 points, or 22.6%, then the largest one-day percentage decline in the index’s history.

The selling was international rather than confined to New York. Markets in Hong Kong, Australia, the United Kingdom, and other financial centers also suffered steep losses. The Dow’s percentage fall remains larger than the percentage loss on any day during the 1929 crash.

Several factors contributed, including high valuations, concerns about interest rates and trade deficits, and computerized portfolio-insurance selling. The crash also exposed weaknesses in market infrastructure and prompted regulators to develop circuit breakers.

“Black Monday” is sometimes confused with Black Tuesday in 1929 or with later market sell-offs that reused the nickname. The 1987 event did not produce a depression like the 1930s, and U.S. markets recovered much of the decline relatively quickly.