When the S&P 500 Index falls by a set percentage
Market-wide circuit breakers in the United States are triggered if the S&P 500 Index falls by 7%, 13%, or 20% from the previous day’s closing value. Level 1 and Level 2 trigger 15-minute trading halts if before 3:25 p.m. A Level 3 decline causes trading to be halted for the remainder of the day. Circuit breakers were introduced in 1988 after the 1987 Black Monday crash.
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