[Hamuko]

Joining an union in Finland is voluntary but most collective agreements are just that - collective. They apply whether or not you're in the union for the entire sector. I think most Finns belong to unions though.

[notkaiho]

Depends a bit on age groups but membership is still pretty high [0].

The collective point is critical - unions negotiate wages as part of a tripartite arrangement in Finland. It's industry-wide sets of wages.

[0] https://yle.fi/uutiset/3-9036556