"Norway's" is the possessive referring by implication to millennials which is the preceding subject in the sentence. >Unlike most millenials, Norway's (milleni

"Norway's" is the possessive referring by implication to millennials which is the preceding subject in the sentence. >Unlike most millenials, Norway's (millenials) are rich. You seem to be making the common conflation of the possessive with the plural of Norway (and of course there's only one Norway).