Black Tuesday was the day of the largest wave of panic selling in the Wall Street Crash of 1929.
It occurred on October 29, 1929, when about 16 million shares changed hands on the New York Stock Exchange. Prices fell sharply as investors rushed to sell, following major declines on Black Thursday, October 24, and Black Monday, October 28.
Black Tuesday is often treated as the symbolic climax of the crash, although the market continued falling afterward. The crash helped mark the beginning of the Great Depression, but it was not its sole cause. Banking failures, reduced industrial production, debt, and weak consumer demand also deepened the economic collapse.