I think you have to be Norwegian to say that, the areas of Norway that is best suited for farming would be the worst of the worst farming land in the rest of Europe.
Without being able to find anything on google, I doubt Norway was even able to feed itself on it own farming land before the industrial revolution.
Why all you people are so fixated with farming? Is it the only possible occupation? Ever heard of fishes, about trade? If rich copper/silver/... deposits were discovered and transportation means existed than it did not matter that terrain was inhospitable.
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