Black Monday was a day of much distress in the financial markets. When the stock market crashed that day, most investors and speculators lost huge sums of money. Many people were also worried about the safety of their money. Black Monday was also known as Black Tuesday on October 19, 1987. 1929. It was one of the worst days in the history of the stock market. More than 16 million shares were traded that day. The Dow Jones Industrial Average fell 30 points, or 12%.One of the main reasons for the fall of stock prices during Black Monday was that investors were worried about the growing economic problems in the United States. The Great Depression had begun. The price of securities was falling. Many investors who had borrowed money from their brokerage firms to buy stocks could not repay their loans. Some people even committed suicide because they had lost everything in investments.Do you know when Black Monday happened? October 29, 1987 is another date that's referred to as Black Monday. In 1987, there was a huge stock market crash on this day. More than 20 million shares were traded. The Dow Jones Industrial Average fell 22 points, or more than 50%.By the time the stock market opened on Black Monday, panic had spread throughout New York City. Many people had lost huge sums of money. Some people were afraid that the United States was going to have a horrible economic collapse, similar to what happened in Germany during the Great Depression.