Six minutes after trading began on the New York Stock Exchange on Monday, it was suddenly halted. That's when the S&P 500 index had plummeted 7% and marketwide circuit breakers kicked in. Trading ...

Forbes contributors publish independent expert analyses and insights. I show you how to save and invest. With the recent market volatility, a reminder on how circuit breakers work may be timely.

Circuit breakers were triggered in Japan, South Korea and Taiwan's stock markets as they reacted to President Donald Trump's sweeping tariffs on Monday, with U.S. markets opening the week sharply ...