I was just reading about historical market events, and something caught my attention that many current traders probably don't know in detail. Black Monday of 1987 was literally one of the most terrifying moments in modern financial history.

What happened on October 19 was brutal: the Dow Jones plummeted 22.6% in a single day. Think about it—this remains the largest percentage drop ever in a single day. We're not talking about normal corrections; we're talking about pure panic across global markets.

The combination of factors was perfect for a storm. Program trading (, what they called portfolio insurance back then ), amplified automatic sell-offs. The market was already overvalued, and on top of that, there were macroeconomic concerns that no one knew how to handle. Basically, it was the perfect domino effect.

What's interesting is that Black Monday 1987 could have been much worse. People were literally fearing we were entering a new economic depression. But the Federal Reserve acted quickly, injected liquidity aggressively, and that was key. They also implemented what they called "circuit breakers," which are mechanisms that pause trading when declines become too severe.

That quick response prevented everything from collapsing completely. It's a reminder of why coordinated intervention matters during extreme crises. Today, we see these mechanisms in crypto markets too, although in different forms.

It's always helpful to remember these historical events when you see volatility in the markets. It’s not the first time something like this has happened, and it definitely won't be the last.