Norway is running on a natural resources boom. They're basically Saudi Arabia but with lighter skin and more human rights (and arguably are more homogeneous culture, no 1000yo religious disagreements or 100yo arbitrarily drawn map lines to create issues like the middle east oil states have).

They openly admit they're boned if the wells run dry or oil goes out of fashion so they hedge by investing in everything else with the game of making enough money in a short enough time (off oil) that they can fund themselves with the appreciation on the nest egg after oil is no longer a money printer. (Saudi Arabia and other wealthy oil funded states are doing similar things to diversify/hedge against future income reduction)