It would be tough to hold him liable in my opinion, because he is giving his opinion in a newspaper. He’s not really guaranteeing anything. Although maybe someone could nail him for misrepresentation if he is intending to profit from this, which is certianly a possibility considering he is the CEO of Prudential. It would be fairly shaky ground to stand on and probably not worth the time, effort and money to sue unless you lost lots and lots of money.