The Dow Jones Industrial Average lost 30.57 points on Black Tuesday, October 29, 1929.
The decline represented a fall of about 11.7%, with the Dow closing at 230.07. Heavy selling overwhelmed the New York Stock Exchange after sharp losses on the preceding Thursday and Monday.
Black Tuesday is often treated as the most famous day of the Wall Street Crash, although the market’s decline continued for several years. The Dow eventually reached its bear-market low in July 1932, far below its 1929 peak.
A common mix-up is confusing the 30.57-point loss with the percentage decline. The much larger one-day percentage fall associated with Black Monday occurred in 1987, not 1929.