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SUMMARY
Felix Prehn, an economist and founder of Goat Academy, analyzes the recent South Korean stock market crash and draws parallels to the unprecedented levels of leverage currently present in U.S. markets. He outlines the risks of concentrated bets on AI-driven stocks, the mechanics of forced selling, and provides a three-step framework for investors to safeguard their portfolios against similar crises.
MAIN POINTS
- South Korea's retail investors, facing unaffordable housing, turned to leveraged stock market bets, primarily in Samsung and SK Hynix.
- A 25% market drop triggered 1.2 million margin calls and wiped out 360,000 Korean accounts, with young investors suffering the most.
- U.S. margin debt now stands at 4.7% of GDP, three to four times higher than Korea's level at the time of its crash, with actual leverage likely understated.
- The global market is heavily dependent on massive AI infrastructure spending by Microsoft, Google, Amazon, and Meta, creating systemic risk.
- Felix recommends investors self-audit for hidden leverage, diversify across uncorrelated assets, and pre-write exit rules to avoid forced selling.
- Felix cautions against overconfidence, noting that investors are paying future prices with borrowed money, and urges learning systems that make market headlines irrelevant.
DETAILED ANALYSIS
The recent collapse in South Korea’s stock market serves as a cautionary tale for global investors, particularly those in the United States. In South Korea, 1.2 million retail investors—dubbed 'ants'—were wiped out as a result of leveraged bets on the stock market. This phenomenon was driven by a generational inability to afford housing, prompting many to seek wealth through equities.
The majority of these investments were not in diversified portfolios but were concentrated in leveraged index funds, especially those tracking Samsung and SK Hynix, which together represented over half of the Korean market. The mechanics of leveraged ETFs meant that when the market dropped, losses were magnified, and margin calls triggered a self-reinforcing cycle of forced selling. This doom loop led to 360,000 accounts being fully liquidated, with the youngest investors suffering the most significant losses.
The severity of the crisis prompted South Korea’s president to declare a national emergency.
The situation in the United States is even more precarious. U.S. margin debt has reached 4.7% of GDP, the highest level ever recorded and significantly higher than Korea’s 1.3% at the time of its crash. In real dollar terms, U.S. leverage is approximately 50 times greater than Korea’s peak exposure.
Moreover, the official U.S. margin debt figures understate the true level of risk, as they exclude leveraged ETFs, options, and private credit. Historical data shows that previous peaks in margin debt—such as during the dot-com bubble (2%) and the 2008 financial crisis (2.3%)—were followed by severe market corrections. The current environment is therefore unprecedented in terms of systemic leverage.
A key risk factor is the concentration of market gains in a handful of technology giants—Microsoft, Google, Amazon, and Meta—who are collectively spending $750 billion on AI infrastructure in 2024. This spending underpins the revenues of chipmakers like NVIDIA and memory suppliers, creating a feedback loop where high valuations justify further borrowing and investment. The market’s dependence on continued hyperscaler spending is reminiscent of the 2000 dot-com crash, where a single order reduction by Coca-Cola led to a collapse in Cisco’s earnings and a 78% drop in the NASDAQ.
Today, a similar cut in AI spending by any of the major tech firms could trigger a cascading effect throughout the market.
Felix Prehn emphasizes that many investors are unknowingly exposed to these risks, with typical portfolios holding 60-70% exposure to the AI trade simply by owning broad index funds like the S&P 500 or NASDAQ. To mitigate these dangers, he proposes a three-step framework: first, conduct a self-audit to identify hidden leverage, including leveraged ETFs and margin usage; second, diversify across uncorrelated assets and right-size positions to prevent any single holding from threatening financial stability; and third, pre-write and automate exit rules to avoid panic selling during market turmoil. He notes that disciplined, prepared investors can capitalize on forced liquidations, while overleveraged participants are wiped out.
The overarching message is not to flee the market but to position oneself on the right side of systemic shifts, maintaining control and resilience regardless of headlines. Felix concludes by warning against the complacency that often precedes major crashes, urging vigilance as investors are currently paying tomorrow’s prices with today’s borrowed money.
LINKS
- Registration page for Felix's free live trading system event.
- Free research report on AI and market risk.
- Winston Stock App free trial and Founders Tier offer.