The risk of an artificial intelligence bubble has, for the first time, become the top concern among credit investors, overshadowing geopolitical worries, according to a Bank of America (BofA) survey.In a February survey of investment-grade clients who buy and sell debt, 23 per cent said the threat of an AI bubble was now their top concern, up from 9 per cent in December, according to BofA strategists Barnaby Martin and Ioannis Angelakis and analyst Mohit Agarwalla.“AI bubble is now seen as the...