
Apocalyptic stories are emerging of how retail investors in South Korea have made, and then quickly destroyed fortunes in the country’s stock market boom and bust and, we may soon learn that institutional investors, trading firms and banks have been damaged by the fallout. Korea’s Kospi index, which more than doubled from the end of 2025 to its mid-June peak, has collapsed by over 40% since then, with a one-day bounce of 18% at the end of last week.
The index has become an economic absurdity and its volatility (VKOSPI index) is greater than during any of the financial and economic crises of the past thirty years, the Asian crisis of the late 1990s included. There will be considerable damage to the South Korean economy, but so far, unlike the Asian crisis, there is relatively modest contagion across other markets (despite South Korea having rocketed into the top six equity markets in the world).
The absence of broad contagion is not an ‘all clear’ signal. Rather, South Korea is the latest, lurid event in an epidemic of speculation across the world, that is built on the financialization of real economy companies, assets and technologies. While South Korea’s largest technology firms, Samsung and SK Hynix, have become key elements in the AI supply chain thematic (specifically for computer memory), their performance has been wildly exaggerated by financial engineering.
Brokers have created leveraged single stock exchange traded funds on these firms and others, and in recent weeks, trading volume in these financial products has outstripped volume in the underlying stocks by a factor of four times. Option trading volume in Korea has exploded, as has the creation of warrants and structured products, again based largely on the memory stocks. Now, some 3x leveraged Exchange Traded Funds (ETFs) are down between 80 to 95% from their recent peaks. Of course, the majority of trading activity has come from retail investors in Korea, many of whom have used margin debt.
This might all be a bit of emerging market fun were it not for the fact that South Korea is emblematic of the global investment ecosystem, which is driven by the logic of AI capital expenditure but built on the increasingly wobbly foundation of financial engineering. As an illustration, LongView Economics, the independent strategy house, has constructed a ‘Speculative Fervour Index’, based on leveraged ETF activity, and it has risen sharply in the past year, coinciding with an all-time high in US household ownership of equities.
From that vantage point there are at least three serious policy concerns for the US and for American retail investors, if they choose to listen.
The first is a repeated transfer of risk from institutions to retail investors. Semiconductors was just the latest episode, following the SpaceX IPO and the rise and fall of silver and gold earlier this year. The day retail investors stop believing they can beat the market, they will be furious. US households have never owned more equities, wealth per adult has never been as high in America, and wealth inequality in the US is straining historical comparisons. Repeated shocks to households will soon have economic and political effects.
The second effect is the relation between investment and the economy. In an era where Carlota Perez’s (author of ‘Technological Revolutions and Financial Capital’) concept of ‘production capital’ is gaining traction, and where the rebuilding of industrial capacity in the US and EU is a necessity, the risk is that financially engineered investment instruments squander capital and misdirect it from economically meaningful investment projects. High stock market valuations may convince politicians that everyone is getting rich, but there is a serial misallocation of capital occurring before them.
This leads to my third point, which is the role of policy makers, central bankers and regulators. It used to be the case that market stability was a concern for regulators and central bankers, the South Korean authorities have been late to the scene of the fire. In the increasingly ‘regulation-lite’ environment of Wall St., the dominance of financial engineering (there are more ETFs than stocks now and option trading volumes continue to surge), the risk of sporadic volatility events, and, at some stage, a much greater unwind. It should also be a concern for Kevin Warsh, and this is just one topic he needs to be more forthright on.
For their part, US investors have carried on where the Koreans have left off. In the past three trading sessions, options trading volumes have spiked, driving equities higher. A volatility ‘event’ may not be far off.
Have a great week ahead, Mike








