The majority of flour coming to either Coop or Migros goes through
Swissmill (in Zürich). You can visit their website (in English), then follow the link to products. Here you will find enough information about most of the flours in Switzerland to answer your questions...
Further tip in their website - click on the picture (where it says Baking Flours), then follow the link to Weichweizen Hauptmehle. Here you will find the pallet price to purchase 100 kg. of flour, which tells you how much 1 kg. is costing a reseller, and hence the approximate margin...so 1 kg. of type 550 should cost a wholesaler 1.45 per kg.
Hope this helps...
Jack