Helliwell, J. F., Layard, R., and Sachs, J. D. (eds.) (2013). World Happiness Report 2013. New York: UN Sustainable Development Solutions Network.
The report ranks countries by the average answer to the Gallup World Poll’s Cantril ladder question, which asks people to rate their life from 0 (worst possible) to 10 (best possible), over 2010 to 2012. The scores the wiki uses, as reported by Live Science (https://www.livescience.com/39489-the-happiest-countries.html), are Canada 7.477, Australia 7.350, the United States 7.082, the United Kingdom 6.883, France 6.764, Germany 6.672, Japan 6.064 and Italy 6.021. They are the baseline for the life evaluation column in What GDP Leaves Out, compared with the 2026 edition.