Earlier quoted context omitted.
> democratic states are consistently better than non-democratic ones Union wages are consistently higher than non-union wages, so we have evidence that unions are an improvement compared to direct relationships with employers. Source: literally every long-term economic comparison of wages done for the last 50 years.
Union wages have always been consistently higher enough to make the idea of shutting down and rebuilding on the other side of the planet just to ship the goods back attractive to many companies.
If unions raised wages enough to offshore jobs those jobs would no longer exist, that union would not exist, and those wages would not contribute to the total average wage breakdowns that show an 18% increase in wages for union members.
Yet, today, union members make 18% more than non union members. The only thing the data actually suggests is that if you want an 18% raise you should join or start a union.