Hartnett: This Is The Biggest Bubble Since The Railroads, But Wait For 2 Things To Happen Before Selling

About a year ago, when a growing chorus was warning that the AI sector was an obvious superbubble, on par with if not bigger than the excesses reached during the dot com days, BofA's Michael Hartnett wasn't so sure, and told his readers that while AI had all the marking of a "mini bubble" it was not the big one yet. Well, in retrospect he was right and those who sold expecting an imminent popping have missed out on impressive gains. 

Fast forward to today, when the BofA CIO is not so sure.