Wall Street analysts warns the AI boom is on 'borrowed time'
The artificial intelligence-driven stock market rally may be entering its final stage, according to a new assessment from Capital Economics.
Wall Street Analysts Warn AI Boom Is on Borrowed Time
The artificial‑intelligence‑driven rally in U.S. equities appears to be moving toward its final phase, according to a fresh outlook from Capital Economics. The firm cautions that while AI‑related stocks may still have short‑term upside, optimism is outpacing fundamentals.
Ai‑driven Market Rally
Capital Economics projects the S&P 500 will keep riding strong AI earnings momentum through the remainder of 2026, with the index expected to close the year around 8,250 points. Yet the analysts argue that the rally is becoming increasingly detached from underlying economic drivers, and they forecast a pullback to roughly 6,500 points by the close of 2027.
Valuation Concerns
The warning stems from valuation metrics that have surged since the AI boom took off in early 2023. The cyclically adjusted price‑to‑earnings (CAPE) ratio has climbed more than 12 points in that span and now sits above 40, a level last observed before the dot‑com bust. Capital Economics notes that most of the S&P 500’s three‑year gains can be traced to this valuation expansion rather than earnings growth.
Concentration Risk
A narrow set of technology and semiconductor firms continues to drive a large share of the market’s advance, heightening concentration risk across U.S. equities. While forward price‑to‑earnings multiples look less stretched, the longer‑term valuation picture remains troubling, according to the research team.
Overheating Signals
The firm points to rising technology‑related capital spending as a share of overall economic output and a near‑record ratio of market value to the net worth of non‑financial corporations as additional overheating indicators. These data points suggest the market may be in a late‑stage rally where prices outpace fundamentals, setting the stage for a correction.
Potential Downturn
Capital Economics does not anticipate an immediate crash, but it warns that weaker‑than‑expected revenue growth or a reassessment of AI spending assumptions could swiftly erode investor confidence. The analysts summed up their view: “We think the AI rally is approaching its last stage but is probably not quite over yet. Accordingly, we expect the tech‑heavy equity markets, such as those in the US, Korea, and Taiwan, to continue to outperform over the remainder of this year. But we expect them to fall, in some cases quite sharply, next year. Our baseline scenario is that the S&P 500 ends 2026 at 8,250 but drops back to 6,500 by the end of 2027.”
Source: finbold.com · 2026-09-12