When Algorithms Panic: AI Sell-Off Exposes Fragile Market Foundations

Global markets are reeling as an AI-driven sell-off wiped billions from tech stocks, triggering a 10 percent plunge in South Korea's Kospi and steep drops across Wall Street. The volatility exposes the fragile foundations of an economic system increasingly reliant on artificial intelligence and automated trading algorithms.

Why did South Korea's stock market trigger a circuit breaker?

Panic over AI valuations sent shockwaves through Asia on Tuesday. South Korea's Kospi index plummeted 10 percent, tripping a circuit breaker that halted trading for 20 minutes. The dramatic fall was dragged down by semiconductor giants SK Hynix and Samsung, which both tumbled more than 12 percent. Together, these two chipmakers make up roughly half of the Kospi's total market value, meaning their individual stumbles can crash an entire national economy.

The Asian sell-off followed a mild tech decline in the United States on Monday, which intensified as trading hours shifted west. Japan's Nikkei 225 fell 3.6 percent, with tech behemoth Softbank sinking 15 percent. Most other Asian indexes closed down more than 1 percent.

How are AI valuations driving Wall Street volatility?

Back in the United States, the tech-heavy Nasdaq dropped 2.21 percent and the S&P 500 fell 1.44 percent. The Dow, which carries less tech exposure, dipped a modest 0.1 percent. It marked the worst day for both the S&P and Nasdaq in about two weeks.

James Reilly, senior markets economist at Capital Economics, captured the growing unease in a note to investors.