The City is buzzing with a familiar anxiety. As I walk through the Square Mile, the chatter is not about interest rates or gilt yields, but about the single most expensive bet in history: artificial intelligence. A concatenation of overvalued stocks, frothy venture capital, and speculative fervour now threatens to cascade, leaving British investors staring at a trillion-dollar hole in their portfolios.
Let us be clear from the start. The AI hype has been a magnificent money-making machine. From Nvidia to a host of fledgling startups, share prices have been inflated by a narrative of limitless potential. But the bottom line, as I never tire of reminding my readers, is that markets are discounting mechanisms. They price in future expectations, and right now, those expectations are nonsensically optimistic.
Consider the fundamentals. The vast majority of AI companies are still loss-making. Their revenues are modest, their costs astronomical. The infrastructure required to run large language models is voracious, consuming energy and hardware like a dragon consumes virgins. Yet their valuations assume they will become the next Google, the next Microsoft, within a decade. This is not investing; it is gambling.
The parallels with the dot-com bubble are uncomfortable. Then, as now, we saw exuberance driven by a belief that ‘this time it’s different’. The internet changed the world, but most internet companies of the late 1990s went bankrupt. The survivors were rare. AI will undoubtedly transform industries, but the market capitalisation of today’s AI darlings implies that they will all be winners. Simple probability suggests otherwise.
British investors are particularly exposed. Pension funds and retail investors have piled into US tech through passive index funds and ETFs. The AI frenzy has been a major driver of S&P 500 returns. If the bubble bursts, the wealth effect will slam consumer confidence, drag down the FTSE 100, and trigger a sharp devaluation of sterling as capital flees to safe havens.
The bond market is already flashing warning signals. The yield curve remains inverted, a classic harbinger of recession. Central banks, including the Bank of England, have been tightening monetary policy to combat inflation. If AI stocks collapse, the financial contagion could freeze credit markets, as it did in 2008. The difference is that this time the bubble is not in subprime mortgages but in intangible assets. That makes it harder to value, but no less dangerous.
Fiscal responsibility demands a reality check. The government has been promoting the UK as an AI hub, offering tax breaks and subsidised loans. Taxpayers are being asked to underwrite a sector that may be economically irrational. If the bubble deflates, these subsidies become wasted public money, adding to our already bloated national debt.
What should British investors do? First, diversify. Do not confuse a good story with a sound investment. Second, focus on cash flow. Companies that generate real profits, not promises, will survive any correction. Third, ignore the gamma squeezes and meme stock euphoria. The financiers of the world are clever, but their self-interest rarely aligns with your retirement.
In conclusion, the AI bubble is real, and the risk to British investors is substantial. The question is not if it will burst, but when. And when it does, those who ignored the signs will pay the price. The market is, as ever, a cruel disciple of gravity.
