Largest single day percentage decline in the stock market's history. How well I remember that day!
Black Monday: The Stock Market Crash of 1987
October 1987
by Donald Bernhardt and Marshall Eckblad, Federal Reserve Bank of Chicago
The first contemporary global financial crisis unfolded in the autumn of 1987 on a day known infamously as “Black Monday.”1 A chain reaction of market distress sent global stock exchanges plummeting in a matter of hours. In the United States, the Dow Jones Industrial Average (DJIA) dropped 22.6 percent in a single trading session, a loss that remains the largest one-day stock market decline in history.2 At the time, it also marked the sharpest market downturn in the United States since the Great Depression.