What nickname describes the sharp U.S. stock-market decline on October 28, 1929?

The sharp U.S. stock-market decline on October 28, 1929, is known as Black Monday.

The Dow Jones Industrial Average dropped 38.33 points, a fall of about 13 percent, on that day. The selling continued into Black Tuesday on October 29, when the Dow fell another 30 points, or roughly 12 percent. Together, the two sessions marked the most dramatic phase of the Wall Street Crash.

The 1929 collapse followed years of speculative buying, widespread use of borrowed money, and rising share prices that had become detached from business conditions. The crash damaged confidence, but historians generally distinguish it from the broader Great Depression, which developed through several interacting economic and financial causes.

A common mix-up is the date: Black Thursday occurred on October 24, Black Monday on October 28, and Black Tuesday on October 29. Black Monday in 1987 is a separate event.