On October 29, 1929, the stock market crashed and the world economy entered the Great Depression. Black Tuesday was the worst day of the crash, with the Dow Jones Industrial Average (DJIA) falling 12%. More than 16 million shares were traded in the panic sell-off. The Roaring Twenties came to an end on October 29, 1929 and the world entered a period of economic hardship. The stock market crashed and the world economy entered the Great Depression. Black Tuesday was the worst day of the crash, with the Dow Jones Industrial Average (DJIA) falling 12%. More than 16 million shares were traded in the panic sell-off.The cause of Black Tuesday is still debated today. Some economists say that it was simply a result of over speculation in stocks; others claim that it was caused by margin buying (investing with borrowed money). Whatever its cause, Black Tuesday had a devastating effect on both Wall Street and Main Street alike. Millions of people lost their jobs, their homes, and their life savings as a result of this economic disaster.