Ask New Zealand how a grocery duopoly is going, it's bad for both consumers and producers.
https://www.rnz.co.nz/news/national/489686/fruit-and-vegetab...
https://www.rnz.co.nz/news/national/489686/fruit-and-vegetab...
Coop and Migros have the biggest margins in Europe. Hardly the picture of competition.
Seems more like tacit collusion.
Note that Switzerland is really a weird country, it’s difficult to compare it with other places.
And I always wondered if the goal is to provide service to customers/"owners" why are they expanding outside their geographical areas like to other countries.
Which is to say, a duopoly is never good.
https://www.abc.net.au/news/2023-02-23/supermarket-profits-s...
Edit: It appears they aren’t related corporations.