Why pay your employees when you can pay a consultant to show how to keep your employee costs low?
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I doubt any union would charge anywhere near that much.
It's hopefully obvious that the union makes it better for at least the lower 50% of performers. It seems likely to me that it makes things better for more like the bottom 90% of performers or more. A lot of anti-union literature is based upon the fact that most people think they are above average.