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, one of the largest equity fundraisings ever globally, includes a $10bn share sale to the US investment group Berkshire Hathaway, which was led until last year by the retired investment guru Warren Buffett for 60 years.Alphabet, behind the Gemini system which has been increasing its ...