‘Black Monday’: 39 years of one of the most chaotic days in the global financial market

The headline refers to "Black Monday," the global equity crash of October 19, 1987, when the Dow Jones Industrial Average fell roughly 22.6 percent in a single session, the largest one-day percentage decline in its history. The Exame piece marks 39 years since that event, framing it as one of the most chaotic days in modern market history. The transmission mechanism at the time ran through portfolio insurance and program trading, where automated dynamic hedging strategies generated cascading sell orders as prices fell, overwhelming liquidity and transmitting stress across markets from Hong Kong to London to New York. Equity index futures and cash stocks were the most exposed assets, with the episode highlighting how derivatives-linked selling could decouple prices from fundamentals in the short term. Traders reviewing the anniversary coverage will likely watch current measures of market-structure resilience, such as circuit breaker thresholds and options-implied volatility, for signs of similar mechanical feedback loops.

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