One of them is a "poseur". The other is "patronising". One suffers from "verbal diarrhoea". The other is a "whiner".
A bust-up on the set of High School Musical 4 perhaps? A scrap behind the catwalk at a Milan fashion show? No. Those accusations were slung round in an increasingly bitter public row between two of the world's most distinguished commentators on global finance and economics, professors Paul Krugman and Niall Ferguson, of Princeton and Harvard, respectively.