Markets take note as world’s biggest equity fundraiser bids to garner more money than three biggest-ever IPOs combined

• Kenneth Rogoff: will AI create a permanent underclass?

Google’s parent company, Alphabet, has said it plans to raise up to $80bn (£59bn) in equity to fund its vast artificial intelligence infrastructure investments, raising further questions over the economics of the AI boom.

The move, the largest equity fundraising ever according to analysts, includes a $10bn share sale to the US investment group Berkshire Hathaway, which was led until last year by Warren Buffett.

Firm says its RTX Spark PC chip for Microsoft Windows will let AI agents replace the mouse and keyboard

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A new front has opened up in the battle for dominance in AI chips, as Nvidia said its latest development could replace the mouse and keyboard in how people use computers.

The $5tn (£3.7tn) US semiconductor company has launched a “superchip” that puts AI capabilities into laptops and desktop computers, a move that will pit it against Intel, Apple, Qualcomm and AMD.