Sweden once again ranked among the happiest countries in the world

Sweden has been named one of the happiest countries in the world in an annual ranking, coming in fourth place behind Nordic neighbours Finland, Denmark and Iceland.

The World Happiness Report is based on surveys of a thousand people in 147 participating countries, who are asked to rate their life on a scale of 0 to 10.

Micael Dahlen, a professor of wellbeing, welfare and happiness at the Stockholm School of Economics, gives his analysis of the results in the clip above.