ECB warns AI-driven market correction likely, citing limited policy buffers to cushion fallout

FRANKFURT — A market correction to the current tech stock exuberance in the United States is likely and could have far-reaching consequences because fiscal and monetary policy buffers are too limited to soften the economic hit, the European Central Bank said in a blog post on Monday.

Investors have piled into technology stocks on bets that artificial intelligence will fundamentally transform the global economy, pushing valuations for top tech companies far above historic averages. The ECB blog, which does not necessarily reflect the institution's official opinion, examined two explanations for the boom-and-bust pattern observed in past technological revolutions.

"Economic research on past technological revolutions points to a worrisome conclusion: a correction of current stock market valuations is likely," the post stated.

Even if the technology succeeds and corporate profits rise, stocks may still fall because it is hard for markets to fulfill excessively optimistic profit growth bets, the blog added. The ECB said the nature of risk changes as the technology spreads across the economy. At an early stage, failure affects individual companies and the risk can be diversified; but as adoption becomes economy-wide, that risk cannot be diversified, so investors demand a higher risk premium. That higher premium historically has tended to outweigh the positive effect of stronger cash flows unless profit growth is strong enough to compensate.

**Two scenarios, both ending in correction**

The ECB economists outlined two frameworks. The "rational view" holds that high valuations can result from extreme uncertainty about a new technology's productivity effects, creating an "option value" that drives up price-to-earnings ratios. The "behavioral view" argues that overconfident and overoptimistic investors push prices beyond fundamentals, and when that optimism fades, prices fall even more sharply than in the rational scenario.

Both views, the authors wrote, "imply a boom followed by a correction, or a pullback from wherever valuations have risen, at some point in the future."

The exact timing is unknowable. "These boom-bust patterns are only identifiable with hindsight," the blog said.

**€440 billion euro-area exposure**

For Europe, a U.S. market correction would be a question of financial stability, the ECB said. Euro-area households have roughly €440 billion ($510 billion) of exposure to the so-called Magnificent Seven stocks — Alphabet, Amazon, Apple, Meta Platforms, Microsoft, Nvidia and Tesla — while pension and insurance firms' exposure is about the same.

Most of that exposure comes through investment funds, including mutual funds and exchange-traded funds, rather than direct holdings. The ECB noted that households may not be fully aware of the associated concentration risk. The fund-based structure could become a transmission channel during a sharp correction: funds may have to sell assets to meet redemptions, first selling liquid holdings and then distressed assets, pushing valuations down further and triggering more redemptions.

"This is why a Mag7 correction is a question of financial stability for the euro area, rather than just a private one," the ECB said.

The euro area's own technology sector presents a smaller risk of a home-grown correction, as price-to-earnings ratios remain considerably below U.S. levels and stock markets are dominated by "old economy" stocks. But euro-area and U.S. stock markets have historically been highly correlated, so local equities will also take a hit, the blog added.

**Less policy room than in dot-com era**

The ECB highlighted a key difference from past corrections. "The more severe scenario is not the equity correction on its own but a correction that coincides with broader market instability that policymakers cannot easily calm: 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 blog said.

The analysis compared the current AI boom to the 19th-century railway boom, the expansion of electricity and radio in the 1920s, and the internet boom of the 1990s. In each case, transformative technologies attracted investment and valuations rose sharply before falling.

The authors said "a US AI fallout would not remain a US problem." Its effects could extend beyond financial markets to euro-area sentiment, financing conditions and hiring.