During the 1929 Wall Street Crash, the Dow Jones Industrial Average suffered its infamous Black Tuesday collapse on October 29, 1929.
Black Tuesday followed Black Thursday on October 24 and Black Monday on October 28. On October 29, about 16 million shares changed hands on the New York Stock Exchange, a record at the time, while the Dow fell roughly 12 percent. The selling reflected panic, speculation, purchases on margin, and growing doubts about the strength of the late-1920s boom.
The crash did not by itself cause the entire Great Depression. It was a dramatic financial event within a broader economic downturn that also involved bank failures, falling production, debt problems, and collapsing international trade. A common mix-up is treating Black Tuesday as the only crash day; the Wall Street collapse unfolded across several trading sessions in October 1929.