Is equality at the heart of our social problems? A whistle-stop tour of the greatest hits of progressive policy Is equality at the heart of our social problems? A whistle-stop tour of the greatest hits of progressive policy I f you’ve written a successful book based around one big idea, what do you make the next one about? Back in 2009, Kate Pickett’s The Spirit Level (co-authored with Richard Wilkinson) argued that inequality was the ultimate cause of almost all our social problems, from