The October 29, 1929, Wall Street stock-market crash is commonly known as Black Tuesday.
On that day, roughly 16 million shares changed hands on the New York Stock Exchange, then an extraordinary volume. The Dow Jones Industrial Average fell about 12%, following a large decline on Black Monday, October 28. The two sessions marked the most dramatic phase of the Wall Street Crash of 1929.
The crash followed years of speculative buying, widespread use of borrowed money, and rapidly rising share prices. Its immediate market damage became part of the broader economic collapse later called the Great Depression. Black Tuesday is sometimes confused with Black Thursday, October 24, the first major panic session of the crash, or Black Monday, October 28.