Comment by snapplebobapple

yes, but everyone else is worse off by a greater amount because that higher price causes other reactions and repricings in the supply chain. There are some really nice graphs in first year economics that explain this. That we are in a potential situation where there is market power being exercised by the employer is basically the only reason we have to even consider that a union could make things better off is because the person with the monopsony doesn't benefit from decreasing output as the union pushes wages higher if the end result is at or below the efficient price for labor.