[Krns]

but by definition isn't a duopoly not competing with each other? I might be wrong, but I remember it being about the two companies making deals with each other to keep both prices high and not innovate or improve, like ISPs in the US

[jaywalk]

No, that is not a characteristic of a duopoly and in many cases is illegal.

[ianai]

Oh it’s illegal so they won’t do it or have a zillion ways to work around it while being technically legal.