The 1987 global stock-market crash that began with the record Dow Jones fall on 19 October is called Black Monday.
The Dow Jones Industrial Average fell 22.6% during that session, while stock markets in other countries also recorded exceptionally large losses. The decline followed years of strong gains and occurred amid concerns about interest rates, international trade, currency values, and expensive share prices.
Computerized trading and portfolio-insurance programs were widely discussed as factors that accelerated the selling. Regulators responded by improving market coordination and later introducing circuit breakers intended to pause trading during extreme declines.
Black Monday is not the same event as the 1929 Black Tuesday. The shared color-based names refer to different crashes separated by 58 years. The 1987 crash was severe but was followed by a relatively quick market recovery compared with the prolonged decline after 1929.