> The oil doesnt' really make that much difference in Norway. They tend to keep most of the money in a state reserve to not create too much inflation.
It absolutely does make a difference to have the world's largest sovereign wealth fund[0], as well as the economic status that allows you to leave it untouched. Simply having guaranteed future access to that kind of wealth changes your political and economic options today.
> Subsitute Norway for non-oil Sweden, a country with huge immigration
Sweden is also comparably small (same size as NYC proper), and much of the "huge immigration" comes from other Scandinavian countries or EU member states. Sweden refuses to publish data on ethnic backgrounds[0], but by all accounts it is overwhelmingly white[1]. Of the top ten countries of origin for Swedish immigrants, 6 are predominantly-white European countries, and the rest are countries with majority Muslim population[2]. Muslim immigrants in Sweden have on average a dramatically lower quality-of-life than the general Swedish population and compared to what is being discussed here. On top of that, they face incredible racism and xenophobia.
So if anything, this supports the point that allowing free migration (as all US cities do) brings average quality-of-life down, not up. (Or to put it another way, it's very easy to maintain a high quality-of-life when you have the freedom to exercise strict control over your borders).
[0] http://www.bbc.com/news/world-europe-24049876
[1] Manhattan, by contrast, was majority non-white for most of the 20th century, and only just surpassed 50% white in ~2011.
[2] https://en.wikipedia.org/wiki/Demographics_of_Sweden#Populat...