The stock market had experienced a period of sustained growth and speculation in the late 1920s, with many people investing heavily in the stock market and borrowing money to do so. The bubble burst on October 24, 1929, when a panic sell-off began on the New York Stock Exchange. This was known as Black Thursday, and it set off a chain reaction that would ultimately lead to the collapse of the stock market. Despite efforts to prop up the market, the panic selling continued, and on October 29, 1929, the stock market suffered its biggest one-day loss in history, with the Dow Jones Industrial Average plummeting by 12.8%. This event became known as Black Tuesday.