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zuminator
on March 9, 2020
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Trading halted as U.S. stocks plummet
This is official policy, but not "common practice." According to CNBC: "These circuit breakers have never been triggered in their current form during regular trading hours."
https://www.cnbc.com/2020/03/09/sp-500-futures-are-frozen-af...
uptown
on March 9, 2020
[–]
The current circuit breaker rules went into effect in early 2013. There were different rules in-place prior to that date.
sdinsn
on March 9, 2020
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And under all rules, the last time it happened was 1997, so it's still signficant
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