Markets on a Hair Trigger: Trump’s Tariff Whiplash and the AI Bubble That Won’t Pop

Markets move as Trump tweets

U.S. stock markets are behaving like a mood ring in a thunderstorm—volatile, reactive, and oddly sentimental.

One moment, President Trump threatens a ‘massive increase’ in tariffs on Chinese imports, and nearly $2 trillion in market value evaporates.

The next, he posts that: ‘all will be fine‘, and futures rebound overnight. It’s not just policy—it’s theatre, and Wall Street is watching every act with bated breath.

This hypersensitivity isn’t new, but it’s been amplified by the precarious state of global trade and the towering expectations placed on artificial intelligence.

Trump’s recent comments about China’s rare earth export controls triggered a sell-off that saw the Nasdaq drop 3.6% and the S&P 500 fall 2.7%—the worst single-day performance since April.

Tech stocks, especially those reliant on semiconductors and AI infrastructure, were hit hardest. Nvidia alone lost nearly 5%.

Why so fickle? Because the market’s current rally is built on a foundation of hope and hype. AI has been the engine driving valuations to record highs, with companies like OpenAI and Anthropic reaching eye-watering valuations despite uncertain profitability.

The IMF and Bank of England have both warned that we may be in stage three of a classic bubble cycle6. Circular investment deals—where AI startups use funding to buy chips from their investors—have raised eyebrows and comparisons to the dot-com era.

Yet, the bubble hasn’t burst. Not yet. The ‘Buffett Indicator‘ sits at a historic 220%, and the S&P 500 trades at 188% of U.S. GDP. These are not numbers grounded in sober fundamentals—they’re fuelled by speculative fervour and a fear of missing out (FOMO).

But unlike the dot-com crash, today’s AI surge is backed by real infrastructure: data centres, chip fabrication, and enterprise adoption. Whether that’s enough to justify the valuations remains to be seen.

In the meantime, markets remain twitchy. Trump’s tariff threats are more than political posturing—they’re economic tremors that ripple through supply chains and investor sentiment.

And with AI valuations stretched to breaking point, even a modest correction could trigger a cascade.

So yes, the market is fickle. But it’s not irrational—it’s just balancing on a knife’s edge between technological optimism and geopolitical anxiety.

One tweet can tip the scales.

Fickle!

When will it be time to worry about the AI bubble?

AI bubble inflating

Key Signals of an AI Bubble

Valuations detached from fundamentals When companies with minimal revenue or unclear business models are trading at sky-high valuations purely because they’re ‘AI-adjacent’, surely it’s time to take note.

Overconcentration in a few stocks If market gains are disproportionately driven by a handful of AI giants (think Nvidia, Microsoft and Amazon etc.), it suggests fragility. A stumble by one could ripple across the sector.

Narrative dominance over substance When investor excitement is driven more by buzzwords (‘transformational’, ‘disruptive’, ‘AGI’) than by actual product performance or adoption metrics, the hype may be outpacing reality. But there is real utility in AI if managed carefully.

Corporate FOMO and rushed adoption Companies scrambling to integrate AI without clear ROI or strategic fit—especially when they start cutting staff to “reskill for AI”—can signal unsustainable pressure.

Retail investor mania If you start seeing AI-themed ETFs, TikTok stock tips, and speculative day trading around obscure AI startups, it’s reminiscent of past bubbles like dot-com or crypto.

What to watch for next

  • Earnings vs. expectations: If AI leaders start missing earnings or issuing cautious guidance, sentiment could shift fast.
  • Regulatory headwinds: New rules around data, privacy, or model transparency could reshape the landscape.

Labour market impact: If AI adoption leads to widespread job displacement without productivity gains, the backlash could be swift.

Money waiting to go into tech, turn it on

Tech money

Reports suggest as much as $3 trillion is waiting on the sidelines to be invested in tech’.

AI FOMO

The reasoning is that AI is driving a fear of missing out (FOMO). We could very well be experiencing the fourth industrial revolution right now, and it is AI-driven. Strategically, companies can’t just sit around and wait. There’s a window where if they don’t join in or realise the potential and grab the opportunity, they’ll miss out.

IPO’s

Three of the biggest initial public offerings (IPO) in the tech’ sector in nearly two years raised some $6 billion collectively in less than a week. Nvidia has attracted much attention with the AI driven interest it has created recently.

While a handful of tech IPOs and one big acquisition wouldn’t have been much cause for celebration in previous years, they are a welcome return after the drought of pandemic-era hit investment.

The IPO market for tech was effectively shut down until Arm Holdings, Instacart and Klaviyo opened the investors door again. Merger activity such as that driven by Microsoft Corp., OpenAI ChatGPT and Activision Blizzard Inc. is helping to lift up the appetitie for investment again. And it’s pretty much AI induced.

Money ready to go

Some analysts suggest there is $3 trillion sitting on the sidelines ready to invest, mostly held by Big Tech and private equity companies. The fascination with artificial intelligence (AI) and fear of missing out (FOMO) will create massive AI led tech investing opportunities. Everyone will want a slice of this cake.

This could very well be the biggest transformational spending wave that we’ve seen in years and certainly since the internet arrived in 1995.

Just look out for that ‘bubble’ again – it will pop! But much money will be made before that happens and then again after.