What was the 1987 global stock-market crash widely called?

The 1987 global stock-market crash was widely called Black Monday.

On October 19, 1987, stock markets around the world plunged. The Dow Jones Industrial Average fell 508 points, or 22.6%, its largest one-day percentage decline. Markets in Hong Kong, Australia, the United Kingdom, Canada, and other countries also recorded severe losses, making the event global rather than exclusively American.

Several factors were discussed afterward, including overvalued shares, rising interest rates, trade tensions, and computerized portfolio-insurance strategies. These automated selling systems could amplify a fall when prices moved sharply. The crash did not produce a depression like the 1930s collapse, and many markets recovered relatively quickly.

The date can cause confusion because different countries experienced their biggest decline on different calendar days. In the United States, October 19 was a Monday; because of time zones, some Asian markets were already trading on October 20. The phrase Black Monday is therefore most strongly associated with the U.S. date.