Lots of people don't view Krugman as a legitimate expert. His opinions are not universally accepted and so I don't think his authority should be assumed. In an

Lots of people don't view Krugman as a legitimate expert. His opinions are not universally accepted and so I don't think his authority should be assumed. In any case, if the underlying argument is valid it really doesn't matter who is making it, right? An appeal to authority is really just a shortcut to avoid the full argument but it only works if the full argument (with no appeal to authority) can be made.