Black Tuesday was the 1929 Wall Street crash day that saw the largest share-trading volume up to that time.
Black Tuesday occurred on October 29, 1929, when roughly 16 million shares changed hands on the New York Stock Exchange. Heavy selling drove stock prices sharply lower and followed the major declines of Black Thursday, October 24, and Black Monday, October 28.
The crash did not by itself create every condition of the Great Depression, but it became its most famous financial symbol. Falling share prices weakened investor confidence, reduced household wealth, and contributed to financial stress that spread through banks, businesses, and international markets.
Black Tuesday is sometimes confused with Black Thursday, the first major panic day of the episode. Black Monday is also a separate name used for October 28, 1929, and for the worldwide crash of October 19, 1987.