ECB warns stock market correction is likely after massive tech rally

Researchers at the European Central Bank published a blog post on August 17 warning that a stock market correction is likely coming, and that the AI-fueled rally in technology stocks has the unmistakable scent of a pattern investors have seen before. The parallel they’re drawing: the dot-com bubble. The case for concern The ECB researchers acknowledged that current tech valuations might reflect rational expectations about AI’s actual productivity potential. The less generous reading, which they also offered, is that historical technology booms follow a fairly predictable arc: initial excitement, soaring valuations, a gradual shift in how investors perceive risk, and then a correction that catches the over-optimistic crowd off guard. What makes this cycle particularly interesting is the nature of the risk shift the researchers described. Early in a tech boom, investors tend to view risk as firm-specific, meaning they worry about whether individual companies can deliver on their promises. Over time, that risk perception broadens to become economy-wide, which is when things get dicey. The S&P 500’s cyclically adjusted price-to-earnings ratio, known as the CAPE ratio, is nearing hi...