‘A feedback loop with no brake’: how an AI doomsday report shook US markets

Shares in Uber, Mastercard and American Express fall on back of apocalypse scenario posted on Substack

US stock markets have been hit by a further wave of AI jitters, this time from yet another viral – and completely speculative – warning about the impact of the technology on the world’s largest economy.

The latest foreboding is from Citrini Research, a little-known US firm that provides insights on “transformative ‘megatrends’”. Its post on Substack, which it called a “scenario, not a prediction”, rattled investors by portraying a near future in which autonomous AI systems – or agents – upend the entire US economy, from jobs to markets and mortgages.

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Why This Matters

Shares in Uber, Mastercard and American Express fall on back of apocalypse scenario posted on Substack

US stock markets have been hit by a further wave of AI jitters, this time from yet another viral – and completely speculative – warning about the impact of the technology on the world’s largest economy.

The latest foreboding is from Citrini Research, a little-known US firm that provides insights on “... The story is categorized under Business with a neutral tone (score 0.04).

In Week 9 2026, Business accounted for 85 related article(s), with UK Politics setting the broader headline context. Coverage of Business decreased by 29 article(s) versus the prior week, but remained material in the weekly agenda.

Coverage Snapshot

Week 9 2026 included 85 Business article(s). Leading outlets for this topic included CNBC, Independent Business, NY Times. Across that cluster, sentiment showed a mostly neutral skew (avg score -0.04).

Key Insights

Primary keywords: markets, feedback, loop, brake, doomsday.
Topic focus: Business coverage with neutral sentiment.
Source context: reported by Guardian Business.
Published: 2026-02-24.
Published by Guardian Business, a widely cited major outlet.
Date context: published during Week 9 2026, when UK Politics dominated weekly headlines.

Tone & Sentiment

The article tone is classified as neutral, driven by the language and emphasis in the summary. The sentiment score of 0.04 indicates the strength of that tone.

Context

This piece fits within the broader Business narrative, connecting current events to ongoing developments. Readers tracking Business trends can use this article as a concise signal of what is shaping coverage right now.

Related Topics

Business

Key Takeaway

In short, this article underscores key movement in Business and explains why it matters now.

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Guardian Business ‘A feedback loop with no brake’: how an AI doomsday report shook US markets