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Passive Investing Bubble Threatens Markets More Than AI
1 Mar
Summary
- Passive investing's explosive growth has inflated US stock valuations by 15% annually.
- Michael Green warns passive funds could trigger a 1929-style market crash.
- Private credit market stress is a significant concern, potentially emerging from this space.

Michael Green, chief market strategist at Simplify Asset Management, believes the excessive popularity of passive investing presents a more significant market risk than the current AI trade.
Green estimates that passive fund flows artificially boost US stock market valuations by approximately 15% each year, a phenomenon most pronounced in large-cap companies. He fears this trend could precipitate a crash reminiscent of 1929.
Beyond passive investing, Green expresses considerable concern for the private credit market, noting that significant financial crises frequently emerge from credit spaces. This comes as the software sector, a major recipient of private equity-backed loans, faces increased selling pressure due to AI's impact on profit margins.




