The report found that inequality was strongly associated with unhappiness — a stark finding for rich countries like the United States, where rising disparities in income, wealth, health and well-being have fueled political discontent.
Denmark topped the list in the first report, in 2012, and again in 2013, but it was displaced by Switzerland last year. In this year’s ranking, Denmark was back at No. 1, followed by Switzerland, Iceland, Norway, Finland, Canada, the Netherlands, New Zealand, Australia and Sweden. Most are fairly homogeneous nations with strong social safety nets.