A senior Bank of Japan official has added a note of caution to the global AI euphoria, warning that the technology's boost to stock markets could quickly unwind if corporate earnings fail to keep pace.
Shinichi Uchida, the BOJ's deputy governor, described AI adoption as “a big positive demand shock” that is spurring investment and excitement. In a speech, he acknowledged that the AI boom has lifted asset prices and loosened financial conditions — but he flagged a growing tension that investors should watch closely.
How AI is easing financial conditions
When stock prices rise, the economy often feels the effects beyond just portfolio gains. Investors feel wealthier, companies find it easier to raise capital, and lenders become more willing to take on risk. That dynamic is what central bankers call “loosening financial conditions,” and it can feed into stronger spending and inflation.
Uchida noted that AI-related firms have been borrowing heavily to fund expansion, which can push long-term interest rates higher. That creates a mixed picture: higher equity prices are doing one thing, while rising bond yields are doing another. For the BOJ, the net effect on the economy is still unclear.
The deputy governor's bigger warning, however, was about expectations. If earnings growth fails to match what stock prices already imply, valuations can reset sharply. When that happens, financial conditions can tighten in a hurry, undoing the very ease that higher asset prices created.
The dot-com lesson
Uchida's “profits need to catch up” line echoes a familiar pattern from the late-1990s dot-com boom. New technologies can be genuinely transformative and still create fragile markets in the short run. Prices often move on a story first, with profits arriving later — or not at all.
If reality lags, the quickest adjustment usually comes through falling price-to-earnings multiples, meaning investors stop paying as much for each dollar of profit. That tends to hit “long-duration” growth stocks first — firms whose value depends heavily on cash they might earn far in the future, a bucket that often includes AI-linked names.
A sharp pullback in those stocks can then ripple through the broader market, tightening financial conditions and potentially slowing economic activity. That is exactly the kind of reversal Uchida is warning about.
What it means for the BOJ and investors
For the Bank of Japan, the link between asset prices and the real economy matters because easier conditions can keep spending and price pressures running hotter. Uchida suggested AI could eventually lift productivity enough to affect the economy's “natural” interest rate — the rate consistent with full employment and stable inflation — but he said the central bank still can't pin down the net impact and will rely on incoming data.
That data-dependent stance means the BOJ is likely to watch market developments closely as it considers future interest rate moves. For everyday investors, the takeaway is more about risk management than prediction. The AI boom has been a powerful driver of stock gains, but the deputy governor's comments are a reminder that markets can move faster than fundamentals.
Investors should be aware that a correction could come if earnings disappoint, and that such a pullback could be swift. Diversification and a focus on companies with solid current earnings, rather than just future promises, are time-tested ways to weather such volatility.
Related reading: Nvidia probes chip shipment reports and rising bond yields pressure global markets.
