[Toddsterpatriot]

We can tell you whether labor unions raise productivity or stifle innovation or raise wages, but we are reluctant to judge whether the tradeoffs are good or bad."

labor unions raise productivity No
stifle innovation Yes
raise wages Temporarily
but we are reluctant to judge whether the tradeoffs are good or bad

You don't need to be a U of C professor to see the tradeoffs are bad.

[A. Pole]

labor unions [...] stifle innovation Yes

Cheap labor stifles innovation: proved by the long history of ancient Egypt and other serf/slave based societies.

USA was the world leader in innovations at the time when the trade unions were the strongest.