When did the stock market crash?

Notable stock market crashes in the United States occurred on Oct. 24, 1929, and Oct. 17, 1987. There is no universal consensus of what constitutes a stock market crash.

A stock market crash is characterized by double-digit percentage declines in stock prices; some definitions require that the declines be sudden or unexpected. The dot-com bubble of the late 1990s and early 2000s ultimately resulted in more than a 50-percent drop in the value of the NASDAQ Composite Index. While the losses were large, there was no single event that occurred while this asset bubble was deflating that has been identified as a crash as of 2014.