[Cthulhu_]

I suspect that's more coordinated - you get the own brand which is generally cheap and cheerful, then the premium brands. I suspect there's some oversight there though.

I think the real question to ask is whether or not Amazon has a monopoly and whether they are abusing it to gain an unfair advantage over the producers of the stuff they sell. I mean when you mention other stores, I don't know if you mean this but I'm picturing e.g. a grocery store - where I come from there's usually three competing ones in the neighbourhood. They will all sell products from a premium brand, alongside their own (cheaper) store brand. But the premium brand is usually available at all competitors at similar prices.