In the buzzy, scruffy warren of offices in New York from which Nouriel Roubini runs his economics aggregration and commentary website, one of the young cyber-serfs has taped a New York Post story about the boss to the chalky wall. “NYU Playboy Warns: Econ Party’s Over”, the sub-heading declares, next to a photograph of a smiling, open-shirted Mr Roubini, sandwiched between two attractive young women.