For both Switzerland and Norway, large parts of the country are pretty much uninhabitable, due to being mountainous and frozen, which pulls down average population density. I can’t speak for Norway, but the parts of Switzerland that aren’t mountains are quite densely populated, e.g. the canton of Aargau, which contains none of the major cities, has a population density of ca. 500/km²; roughly on a level with the Netherlands or New Jersey.
Both countries also have a very high cost of living.
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