Is it common to have single location unions? Seems to me that this does not add very much negotiation power for the workers. In my country large unions negotia

Is it common to have single location unions? Seems to me that this does not add very much negotiation power for the workers. In my country large unions negotiate for a whole sector, so all café workers regardless of their employer are covered by a collective agreement. You don't even have to be a member for the negotiated benefits (such as minimum wage) to apply: the collective agreement covers everyone in the sector nonetheless.