What Causes Stock Market Trading to Halt? On Oct. 19, 1987, the day ominously known as "Black Monday," the Dow Jones Industrial Average (DJIA) plummeted a crippling 22.6 percent. To prevent such a violent single-day crash in the future, the U.S. Securities and Exchange Commission (SEC) implemented safety mechanisms meant to temporarily halt panicked sell-offs. Here's how they work. |
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