In Japan, the "circuit breaker" system paused trading for 10 minutes ... trading would be halted for 15 minutes. If it drops 20 per cent, trading would stop for the rest of the day.

THOMAS SAMSON/AFP via Getty Images A Level 3 circuit breaker is triggered if the S&P drops 20 percent in value. In this case, trading is halted for the rest of the day to give investors further ...

The breakers pause trading for 15 minutes when stock prices decline by 7% during a single day and again when drop they decline by 13% for the day. After a fall of 20%, trading shuts down for the day.

If the S&P 500 drops 20%, and triggers a level 3 circuit breaker, trading would stop for the rest of the day. The S&P 500 traded as low as 5,101.75 on Friday, down more than 5%. While this ...

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