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Bearish blog post batters the market

Bearish blog post batters the market

Substack posts are moving markets

ByLucas Arender

Feb 25, 2026

Investor fears about AI have reached the point where blog posts have become billion-dollar market movers. 

Driving the news: A viral Substack post predicting a future of economic pain caused by AI disruption seemingly sparked a mass market selloff on Monday, sinking the stocks of software firms and other companies mentioned in the essay. 

  • The 7,000-word post, published in the popular finance newsletter Citrini Research, mapped out a scenario where AI induces a crippling financial crisis.

  • As one former Morgan Stanley analyst put it, “every stock that got mentioned got mauled.” DoorDash fell 6%, Visa and Mastercard were down 4.6% and 5.7%, respectively, and IBM tumbled 13% — its worst one-day performance since 2000.

Catch-up: In Citrini’s near-future scenario, the recent SaaS selloff is just the first tremor of a broader crash. As AI lets companies replicate more software in-house — and slash their contracts with software firms as a result — mass layoffs ensue.

  • In this feedback loop, better AI drives white-collar layoffs and lower consumer spending, squeezing margins and pushing firms to double down on even more AI.

Yes, but: The theory has its critics, with one commentator dismissing it as nothing more than a “scary bedtime story”. Others pointed out that in this scenario, productivity increases drastically while consumption collapses (which economic theory suggests is unlikely). 

Why it matters: Whether it’s realistic or not, the fact that a Substack post full of theoretical scenarios can erase billions of dollars in market value highlights just how emotional, uncertain, and trigger-happy the trading around AI has become.—LA

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