A load of bs. I mean the whole "study".
Measuring mental wellbeing is a tricky business. But the US non-profit, Sapien Labs, has had a go with its Mental State of the World report
Our Founding Story Sapien Labs was born out of a weekend experiment with shocking results. In 2014 our founder Dr. Tara Thiagarajan, a PhD in Neuroscience from Stanford, was running a microfinance company called Madura that was working across 25,000 villages and small towns in India. Madura had built a research group that was working to understand drivers of economic outcome in impoverished communities. A large field team gathered data on ecosystem and individual level variables to identify those that predicted the economic success of both individuals and entire villages. Over a thousand different variables were sampled across tens of thousands of people, including cognitive metrics. In this process they encountered many unexpected and curious cognitive dimensions and outcomes. The obvious question was – what was going on in their brains?
It's another free market ranking with some "cognitive metrics" by someone "running a microfinance company called Madura that was working across 25,000 villages and small towns in India." Countries with more microloan banks are happier, I bet.