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How useful are circuit breakers?

China's circuit breakers were repeatedly triggered from Jan 4 to Jan 7, prompting trading to be closed for the day on Jan 7 after only 30 minutes.

BECAUSE of the massive volatility in global equity markets over the past fortnight, an interesting piece of news may have passed relatively unnoticed - the apology by China's market regulator for its "shortcomings" in the way it handled steep plunges in its stock market.

"The abnormal...