The 29 October 1929 U.S. stock-market collapse is known as Black Tuesday.
Black Tuesday followed Black Thursday on 24 October and the severe selling on 28 October, called Black Monday. On 29 October, investors traded millions of shares while prices fell sharply on the New York Stock Exchange. The panic marked the most famous phase of the Wall Street Crash of 1929.
The crash did not by itself cause the entire Great Depression, but it destroyed wealth, damaged confidence, and intensified existing economic weaknesses. Banks, businesses, and households were affected as falling asset values reduced spending and investment.
Black Tuesday is sometimes confused with Black Monday, the previous trading day’s collapse, or with Black Tuesday in other historical contexts. In stock-market history, the name specifically identifies 29 October 1929.