So why does it work so well in Nordic countries then? Unionisation is the norm here
Sectoral bargaining is when a union covers an entire sector of the economy, e.g. telecom, electrical, aviation.
In sectoral bargaining, companies don't fight unions as hard. ("We'll have to pay our workers more, but all our competitors will too, so we won't be at a relative disadvantage.")
[0] https://en.wikipedia.org/wiki/Sectoral_collective_bargaining