The 1929 U.S. stock-market crash day when trading volume reached a record 16.4 million shares was Black Tuesday.
Black Tuesday occurred on October 29, 1929, at the New York Stock Exchange. Investors sold roughly 16.4 million shares, a record at the time, and the Dow Jones Industrial Average fell about 12%. The selling followed Black Thursday on October 24 and Black Monday on October 28.
The crash did not by itself cause the entire Great Depression, but it damaged confidence, reduced wealth, and helped intensify economic problems already developing. Banks, businesses, and households were affected as investment values collapsed.
Black Tuesday is sometimes confused with Black Monday, the previous trading day in the same crash. The two dates formed the most famous climax of the 1929 Wall Street collapse.