How important is AI to the stock market? Warnings bring new scrutiny
abcnews.com Sep 18, 2026

How important is AI to the stock market? Warnings bring new scrutiny

AI-summarised brief · reviewed before publication

Analysts warned that renewed scrutiny of artificial intelligence could pose a risk to the U.S. stock market, even as AI continues to drive robust earnings and investor optimism. This year, the Dow has risen nearly 8%, the S&P 500 11%, and the Nasdaq 13%, while AI‑focused firms such as Nvidia and AMD posted gains of 18% and 155% respectively. Heavy capital inflows into data centers and advanced chips have spurred what market observers describe as “hundreds of billions of dollars” in AI infrastructure spending, contributing roughly a third of GDP growth in 2026, according to ING Markets. Yet a recent MIT study found that about 95% of AI projects fail to generate profit, highlighting adoption challenges that could temper future market enthusiasm.

💡 Why It Matters

  • · Investor confidence hinges on whether AI’s hype translates into sustainable returns, and mounting doubts could trigger a sharp reassessment of valuations across tech‑heavy portfolios.