Everybody is concerned with ‘herd immunity’ at present as the pandemic continues on ravaging our social and economic lives. But I have been studying the concept of ‘herd mentality’ for some years, aka – Groupthink. Mainstream macroeconomics is sustained, not by any internal logical consistency (on which it fails), by close congruency with the empirical data (on which it fails), which are the usual qualities of a dominant system of ideas, but, rather, by (using modern terminology) its long-standing and on-going cancel culture. So it is rather amusing to read one of the leading voices in that paradigm, Kenneth ‘Spreadsheet’ Rogoff, whinging on the Internet that ‘cancel culture’ is being used to undermine the reputations of one of his mates (Larry Summers). Both continue to get platforms in the world media without trouble to push their vapid ideas into the narrative. The antithesis of cancel culture it would seem. What is going on is that more people are realising that the prognostications of mainstream macroeconomics are deeply flawed, and, while many may not know the technicalities and the theoretical complexities, they can see the empirical dissonance, and that means they know a – lemon – when they see one. And social media has given more people a voice and they are using that to call these characters out for what they are. And the sense of invulnerability that pervades all disciplines riddled with Groupthink is being questioned.