A hairdresser in Norway has to be paid a lot because otherwise they can take one of the abundant high paying jobs in the oil industry with no additional trainin

A hairdresser in Norway has to be paid a lot because otherwise they can take one of the abundant high paying jobs in the oil industry with no additional training. How would you level pay for hairdressers in Norway and those in e.g. Sweden? There already are basically no restrictions on movement.