There's a Norwegian chain grocer down the way, one of the select few predominant food chains in Norway. This chain brands itself with low prices, and particularly low prices on fresh fruits and vegetables. Appropriately, their color scheme is bright green.
This store just completely ignores the existence of the non-chain Turkish grocer right across the street from me, despite the Turkish place having a vastly larger variety of greens at much lower prices. I remember in particular there was a special deal over at the Norwegian store, Kiwi (yes, it's a bright green store focusing on fruits and vegetables, and it's called "Kiwi"), for Pakistani mangoes. The special was that, normal price per mango was 15kr a piece, but you could buy two for 20kr.
On my way home, I walked past the Turkish place and saw that they were also selling Pakistani mangoes. 5kr per each.
The thing is, Kiwi is an entrenched brand, and Norwegians are highly skeptical of anything (and anyone) that they didn't grow up knowing. So Kiwi can freely charge two to three times as much as the other store simply because they know they can get away with it. They don't have to care about the competition, because it's not really competition.
As for competition between the primary grocery chains in Norway, that's not really a thing because all the chains are owned by the same supergroup... Because that's fine, apparently.