This is a worrying take for investors, arguing the AI boom is a bubble that could crash the market and drag down the whole economy.

• Veteran investor Jeremy Grantham says AI stocks are a bubble that could prove disastrous, sparking a heated on-air fight about crypto and faith-based investing.
• The world's central banks have echoed this, warning that huge AI spending is building up risks that could amplify any future shock.
• About a third of the big tech giants is now tied to AI, creating a trap: either AI wipes out millions of white-collar jobs, or the market crashes — possibly both.
• Cheap Chinese open-source models are nearly as good as top US ones, threatening the trillion-dollar valuations because most companies don't need the very best.
• A red flag for the hype: Ford rehired hundreds of human engineers after its AI failed quality checks, even as its overall workforce keeps shrinking.

Outlook: Expect more bubble warnings and a likely painful correction, with the market caught between mass job losses and overvalued AI stocks.