Richard Wilkinson and Kate Pickett co-authored the book "The Spirit Level: Why Equality is Better for Everyone." In this book, they argue that more unequal societies tend to have worse social and health outcomes for their citizens, even the wealthy ones. They present a wide range of data and research to support their claim and highlight the negative impacts of inequality on various aspects of society, including health, education, crime rates, and social mobility. The Spirit Level proposes that reducing income inequality is not only beneficial for those at the bottom of the social ladder but also for society as a whole.
