When the World's Stock Markets Collapsed in a Single Day of Financial Chaos
In short: On October 19, 1987, global financial markets suffered a historic, sudden crash. Known as Black Monday, the event saw the Dow Jones Industrial Average plummet by over 22 percent in hours. As panic spread from Wall Street to international exchanges, investors faced a terrifying, modern-era financial crisis that defied expectations.
The collapse of October 19, 1987, remains the largest one-day percentage decline in the history of the Dow Jones Industrial Average. By the time the closing bell rang, the index had shed 508 points, wiping out more than 500 billion dollars in value. The contagion was not limited to the United States; markets in Australia, Hong Kong, Singapore, and Mexico also experienced severe plunges, fueling widespread fears that the world was spiraling into a repeat of the 1929 crash and the subsequent Great Depression.
Several factors likely converged to trigger the panic. In the months leading up to the crash, investors were already wary of rising interest rates, persistent trade deficits, and a weakening dollar. The situation was further aggravated by the use of computer-based portfolio insurance models, which automatically triggered massive sell orders as prices dipped. When the market opened on that Monday, a massive imbalance between sell and buy orders overwhelmed trading systems, causing significant delays and communication failures across the New York Stock Exchange.
Despite the initial devastation, the long-term economic fallout was surprisingly contained. Central banks in Japan, West Germany, and the United States acted to provide liquidity, which helped stabilize financial institutions and prevented a broader collapse of the real economy. While some nations, such as New Zealand, suffered more lasting damage due to their monetary policy choices, the global market proved resilient. Remarkably, the Dow Jones surpassed its pre-crash peak in just over two years, setting the stage for the massive bull market of the 1990s.
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Sources
- Summary by Intellect · source: Research Guides: This Month in Business History: The Black Monday Stock Market Crash
- Also: Black Monday (1987)
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