Paul Krugman said the Korean stock market is now reading as a test of faith in AI spending, with Korea’s KOSPI index serving as a barometer for expectations about capital investment tied to AI. He said the index looks like a “real crisis of faith.”
Krugman said that much of the AI investment boom has gone to imported equipment, and that the scale of spending only makes sense if AI delivers large economic payoffs. He added that first-movers would need to keep a large share of those returns, because cheaper second-mover products could compete them down.
Paul Krugman and KOSPI
Krugman linked that warning to Korea’s concentration on semiconductor production. In his view, that makes KOSPI a useful gauge of how investors in Korea are judging AI capital expenditure, not just company results.
He said yesterday he gave Claude an image and asked, “What is this a picture of?” Claude replied with a detailed description of a tuxedo cat curled up asleep on a patchwork quilt. Krugman used the exchange to underline how remarkable the technology everyone calls AI has become, while also saying even leading AI innovators were shocked by the power of simple arithmetic operations applied repetitively to massive amounts of data.
AI spending and returns
The practical issue for investors in Korea is whether heavy spending on AI and AI-related companies can earn enough back to justify it. Krugman said Korean companies with lighter-weight models could compete with ChatGPT and Claude by using much less compute at a lower price, which would pressure the return assumptions behind bigger outlays.
That is why the KOSPI move matters as a market signal rather than a single-stock story. It reflects whether buyers think the early phase of AI spending can still produce gains that survive competition, or whether the market is moving past the first burst of enthusiasm.
End of the early euphoria
Krugman said the KOSPI does not point to a U.S. recession. He said the current moment feels like “the end of the early euphoria, of the triumph of hype over experience.”
For investors in Korea, that leaves the stock market acting less like a broad economic warning and more like a check on whether AI capital expenditure can still earn the returns that justified it in the first place.
