On what date did the 1987 “Black Monday” stock-market crash take place?

The 1987 “Black Monday” stock-market crash took place on October 19, 1987.

On that Monday, stock markets around the world plunged. The Dow Jones Industrial Average fell 22.6% in one session, its largest one-day percentage decline. The sell-off spread internationally, affecting markets in Hong Kong, Australia, the United Kingdom, and elsewhere.

Several factors were discussed afterward, including rising interest rates, trade concerns, investor anxiety, and computerized portfolio-insurance strategies. Those automated strategies could generate additional sell orders as prices fell, intensifying the downward movement. The exact cause was not reduced to one universally accepted trigger.

Black Monday is sometimes confused with the 1929 crash because both events became associated with dramatic October losses. The 1987 collapse was different in important ways: the economy did not enter a depression, and U.S. markets recovered relatively quickly. Regulators later introduced circuit breakers designed to pause trading during extreme declines.