Dysfunctional Societies: How Equality Makes Societies Stronger What distinguishing feature do the world's healthiest and happiest societies have in common? According to acclaimed author Richard Wilkinson, the answer is simple: they have far less income inequality than other societies. In this film based on his international best-seller "The Spirit Level," Wilkinson focuses on why the U.S., despite being one of the richest nations in the world, lags behind so many other rich Western societies in