European central bankers are warning that the AI-driven stock rally is headed for a painful correction. And if they're right, your 401(k) will feel it whether you own a single share of Nvidia or not.
Nvidia shares have risen by a factor of twenty since 2022. The S&P 500's cyclically adjusted price-to-earnings ratio is near its historical peak, territory last seen during the dot-com bubble. Five economists published the analysis on the European Central Bank (ECB)'s website Monday. The bank was careful to note the views are their own, not the ECB's official position.
“A correction of current stock market valuations is likely.”
The paper offers two reasons. First: even rational valuations correct. When AI was a bet on a handful of chipmakers, a failure stayed contained. Now that banks, hospitals, and manufacturers are running on the same stack, a major failure is everybody's problem. Investors price that in, and prices fall.
The second is simpler: herd behavior. "Overconfident, overoptimistic investors bid up prices beyond fundamentals," the ECB authors wrote. When sentiment breaks, prices don't return to fundamentals. They overshoot below them.
The ECB paper cites the railroad boom of the 1800s, electricity and radio in the 1920s, and the dot-com era of the 1990s. In each case, technology survived. Investors who bought at the peak largely did not.
The authors allow that AI could still justify today's valuations, or go higher, even after a correction. Nobody knows when it hits. "The exact timing is unknowable in advance. These boom-bust patterns are only identifiable with hindsight."
Euro-area households have roughly €440 billion exposed to American technology stocks through mutual funds and ETFs. Insurance companies and pension funds carry comparable positions. The same is true here: Most American retirement accounts are indexed, meaning tens of millions of workers are concentrated in the same seven companies whether they know it or not. The average 401(k) holder puts $2,358 into Magnificent Seven stocks every year, often without realizing it.
Nobody decided to bet their retirement on Alphabet, Amazon, Apple, Meta, Microsoft, Nvidia, and Tesla. They bought an index fund and moved on. The Magnificent Seven dominate those indexes so completely that passive investing is, functionally, a concentrated bet on seven companies. The ECB paper noted most households are "not necessarily aware of the associated concentration risk."
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The fund structure makes it worse. Redemptions force managers to sell. More selling drives prices lower. More investors panic. The ECB economists warned the damage wouldn't stop at the portfolio level. It would hit borrowing costs, business lending, and hiring.
European price-to-earnings ratios are considerably lower than in the U.S. That offers limited cover. "US equity stress has historically also had an impact on euro area stock markets," the ECB authors noted, through fund flows, lending conditions, and sentiment.
Policymakers would start from a worse position than they did after the dot-com crash. Years of low interest rates and deficit spending have left governments with far less room to maneuver. The Fed can't cut its way out of a crisis it doesn't have room to cut from. Washington can't spend its way to stability when it's already drowning in debt.
“Unlike in the dot-com episode, today’s starting point leaves markedly less room to cut interest rates or use fiscal policy to cushion the fallout.”
The bill for decades of easy money and deficit spending doesn't come due gradually. It tends to arrive all at once. As the ECB authors put it, a U.S. correction "could extend beyond financial markets to euro area sentiment, financing conditions and hiring. A US AI fallout would not remain a US problem." American workers and retirees are sitting on the same concentrated positions, with the same depleted government toolkit to cushion the blow.
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