What was the popular name for the October 28, 1929 U.S. stock-market collapse?

Black Monday was the popular name for the October 28, 1929 U.S. stock-market collapse.

On October 28, 1929, the Dow Jones Industrial Average fell 38.33 points, or about 12.8 percent. The decline followed a tense week on Wall Street and occurred one trading day before the even larger fall commonly called Black Tuesday. Heavy selling, margin calls, and weakening confidence amplified the move.

Black Monday and Black Tuesday are parts of the Wall Street Crash of 1929, rather than separate long-term crises. The crash did not by itself cause every feature of the Great Depression, which also involved banking failures, debt problems, falling prices, reduced demand, and international economic pressures.

A common mix-up is assigning the name Black Monday to October 19, 1987. That later event is also called Black Monday, but it is a different crash. In 1929, the sequence is usually remembered as Black Thursday, Black Monday, and Black Tuesday.