When people are asked what matters most for their happiness and wellbeing, they tend to talk about the importance of their relationships with family, friends and colleagues. It is their intimate world, their personal networks that mean the most to them, rather than material goods, income or wealth. Most people probably don’t think that broader, structural issues to do with politics and the economy have anything to do with their emotional health and wellbeing, but they do. We’ve known for a long time that inequality causes a wide range of health and social problems, including everything from reduced life expectancy and higher infant mortality to poor educational attainment, lower social mobility and increased levels of violence. Differences in these areas between more and less equal societies are large, and everyone is affected by them.