South Korea’s AI Bubble Just Popped
In a Nutshell
South Korea’s KOSPI crashed 25% in three weeks after Samsung and SK Hynix—over half the index—plummeted on U.S. AI-spending fears, wiping out 320,000 leveraged retail accounts and triggering government intervention. The market’s extreme concentration, combined with widespread margin debt and 2x-3x leveraged ETFs, turned normal selling into a self-reinforcing liquidation spiral. U.S. margin debt now sits at a record 4.5% of GDP and the same hyperscaler AI capex that fueled the Korean rally is the single point of failure that could ignite an identical unwind stateside.
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Three weeks prior to the video, South Korea's KOSPI was the best-performing stock market globally, rising nearly 200% over the previous 12 months. By comparison, the US S&P 500 gained only 24% during the same period. Samsung rose over 500% at one point during the year, while SK Hynix surged more than 1,000%.
The US S&P 500 has its top 10 companies representing 36% of the index. In contrast, just two companies—Samsung and SK Hynix—account for over 56% of the entire KOSPI. This concentration stems largely from retail investors, with roughly 14 million individuals borrowing money to invest in these two stocks.
Within 21 days, the KOSPI dropped 25%. This triggered margin call thresholds in 1.2 million accounts—equivalent to one in every 30 people in South Korea. Over 3 trillion won in investments were automatically liquidated by brokers. Approximately 320,000 accounts were wiped out, some overnight. The South Korean president convened an emergency intervention for the stock market.
South Korea operates a faster, smaller-scale version of the same leverage-driven market structure used in the United States. The Korean events may serve as a preview of potential developments in the US market.
South Korea has 51 million people, with 14 million (one in four) participating as retail investors, often called "ants." Cultural expectations pressure young people to secure good jobs, own homes, and start families by certain ages. With housing prices making homeownership unrealistic for many, a generation turned to the stock market as their primary wealth-building vehicle. Finance influencers described the stock market as the "last chance" to build wealth.
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