Earlier quoted context omitted.
https://www.cnbc.com/2018/03/16/these-are-the-top-10-happies... White countries with low diversity.
These are all modern economies, most of which operate immigration-friendly regimes. Sweden, Netherlands, Switzerland, Iceland, Denmark, Norway and Finland are all signed up to freedom of movement, which doesn't discriminate on the basis of religion, ethnicity or place of birth, provided you are a citizen in the EEA or Switzerland, or if you are married to such a citizen. Anyway, the point is not that diversity cultiv…
>These are all modern economies
They aren't the only modern economies. Demographics plays a role.
>most of which operate immigration-friendly regimes
Recent policy and current demographics are two different things. These are still homogenous countries for the most part, especially Iceland which is exceedingly safe. Where demographics have shifted drastically away from the native population, the quality of life has reduced. (Look at Malmo, for example.)
>That happiness boost is nowhere to be seen when looking at real world examples.
http://archive.boston.com/news/globe/ideas/articles/2007/08/...
Here's a list of countries ranked by diversity: https://en.wikipedia.org/wiki/List_of_countries_ranked_by_et...
Doesn't look like a happy list.