BBC: Is the AI stock market bubble about to pop

[Darren51]

The BBC has published a video report examining whether the AI-driven stock market rally is a bubble approaching its bursting point. The timing is perfect: Broadcom left its full-year AI chip guidance unchanged this week, triggering a Nasdaq selloff of 4.06% - the worst session since October. Nvidia fell 6.3%, Micron slid 13.3%, and the VIX spiked 34% above 20 in a single day.

Ray Dalio made headlines in early June describing AI as being in the early stages of a bubble comparable to 80% of the euphoria seen before the 1929 crash and the 2000 dot-com peak. The Bank of England and IMF both flagged AI stock valuations as stretched in October 2025. Palantir traded above 100x price-to-sales entering 2026. The S&P 500 Shiller P/E ratio is at its second-highest level since 1871.

Watch: Is there an AI stock market bubble, and is it ready to burst?www.bbc.co.uk

[Sinead_47]

The Broadcom moment this week is the most useful data point in the bubble debate. Markets were pricing in an AI guidance upgrade and when it did not come the whole trade unwound in one session. That is what fragile sentiment looks like

[Leah_68]

The VIX above 20 for the first time in months after one bad earnings guidance is a warning sign. Complacency built up over 10 consecutive winning weeks and now the first crack is showing how quickly that can unwind

[QuantumLeap]

Ray Dalio calling it 80% of dot-com peak euphoria in early June and then the Nasdaq dropping 4% days later is not a coincidence. Sentiment was already stretched and Broadcom gave the market a reason to reassess

[GoldbergFan]

The Shiller P/E above 40 is the uncomfortable number. The only two previous times it reached that level were 2000 and 2022. Both were followed by significant drawdowns. Valuation does not set the timing but it does set the eventual magnitude

[Idle Mila]

The counter-argument is that the dot-com bubble was built on companies with no revenue. Nvidia has $80 billion in revenue. Meta grew 33% last quarter. Microsoft has $240 billion in revenue. These are real businesses being compared to Pets.com and that comparison is not fair

[Ryan84]

The circular investment argument is the one I find most convincing. Hyperscalers are spending $300B+ on AI capex. That capex goes to Nvidia and other chip companies. Those companies' valuations support the hyperscalers' own valuations. At some point actual end-user revenue has to justify the whole structure

[Shane96]

No this is a liquidity issue caused by spacex IPO . People had to sell to buy. Not enough cash on hand. Similar to Anthropic and OpenAI IPOs