Remember Nudge? It was a 2008 book by Chicago economist Richard Thaler and Harvard Law professor Cass Sunstein, full of bright technocratic ideas for using ‘choice architecture’ to ‘nudge’ the plebs to make the ‘right’ decisions. The Guardian’s reviewer called it ‘never intimidating, always amusing, and elucidating: a jolly economic romp with serious lessons within’. On Saturday, the Guardian published a whistleblower’s account of how Cambridge Analytica used data originating from ‘tens of millions' of Facebook profiles to construct choice architecture that could nudge the plebs to really vote the ‘right’ way, by using targetted adverts to swing marginal constituencies...