The first thing you have look at is the cost of ground beef. In the US ground beef runs around $3.25 a pound, in Norway the average cost for a pound of ground beef is slightly north of $9.00 a pound. Take into account similar costs for other items in the Big Mac and you can see how the cost gets to $7.00 in a hurry.
I can't really speak about the cost comparatively in Norway because the wages may be way higher in that country, but a Big Mac is not worth that. A Big Mac is not really real food and should not cost that much. You should spend money on healthier food for you.
The Big Mac is a popular sandwich, but it is not worth $7.00. Many people might pay that price for one now and then, but based on the quality of food, the price is way too high. You could get a much better meal of higher quality for that price.
No way! I'm not sure what it costs to ship everything, but no wonder none of my Norwegian friends ever go out to eat! That is insanely expensive! Maybe for like an entire meal I could see it being that much, or maybe a dollar more, but not just for the sandwich.