ECB Warns of Imminent Tech Stock Correction Due to AI-Fueled Boom-Bust Cycle

The European Central Bank (ECB) has warned that a correction in stock market valuations is likely due to the boom-and-bust nature of technological revolutions, particularly those driven by artificial intelligence. According to an ECB post, U.S. stock market valuations are currently close to their historical peak, while euro zone equity valuations have also risen, albeit to a lesser extent.

The economists point out that two complementary explanations from economic research suggest a coming correction: the 'rational view' and the 'behavioural view'. The rational view suggests that high valuations can be justified by extreme uncertainty about a new technology's productivity, but as adoption spreads, uncertainty shifts to the entire economy, prompting investors to demand a higher risk premium.

The behavioural view, on the other hand, attributes high valuations to overconfident and overoptimistic investors bidding up prices beyond fundamentals. Prices can fall even more sharply than in the rational scenario once that overconfidence fades.