Oct. 19, 1987, also called “Black Monday.” Over the weekend before, Iran had fired missiles over the Persian Gulf, causing some nervous moments. But then, an article in The New York Times claimed that the US wanted a lower-valued dollar. This prompted foreign investors to start to dump stocks because they would be worth less money in dollar terms. The markets at the time did not have any circuit-breakers, which now stop trading after about a 10 percent decline in one day.
Instead, the falling markets resulted in yet more selling, which basically snowballed as computer-generated trades kept pressure on the market the entire day. “The only thing that kept the market from melting down even more was the closing bell,” recalls Mr. Dickson.
The next day the Federal Reserve Bank stepped in, reducing interest rates. The stock market reversed itself, moving higher.
Oct. 28 and 29, 1929. On Monday the 28th, the stock market fell 12.82 percent and then dropped another 11.73 percent the next day. The stock market of the 1920 had a lot of “wild West” in it, with little supervision over trading. The public had become enthusiastic buyers of stock, using “margin,” or borrowed money, to finance their purchases. Thus, when the market dropped sharply – in an era when stock prices were not instantaneously known – the public lost most of their savings. This lead to the Great Depression and, eventually, to reforms such as the formation of the Securities and Exchange Commission.