Circuit Breakers: The Stock Market's Safety Net
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The U.S. stock market has a built-in emergency brake called the circuit breaker—a safety net to halt panic selling. Here’s how it works: If the S&P 500 drops 7% from the prior close before 3:25 PM ET, trading pauses for 15 minutes (Level 1). A 13% plunge triggers another 15-minute halt (Level 2). But if it crashes 20%, markets shut down for the day (Level 3). This system was born after the 1987 Black Monday crash (when stocks nosedived 22% in a day). Critics argue halts can worsen liquidity crunches—like during the 2020 COVID meltdown when it triggered four times in weeks. But most agree: Without these timeouts, algorithmic trading and fear could spiral into a full-blown crisis. Fun fact? The U.S. borrowed the concept from China’s market limits—but unlike individual stock halts there, ours hits the entire market. Think of it as Wall Street’s ‘chill button’ before things go full Margin Call."
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