[drdec]

> I guess that's why top performing movie stars, NBA basketball players etc. have their wages depressed?

I can't speak to movie stars, but as for the NBA, there is absolutely the concept of a maximum salary (depends on years of service plus other things besides the point) in the collective bargaining agreement. This limits the compensation a player may receive from a team for a particular year. The top players like LeBron James, Kevin Durant, Stephen Curry, would no question receive higher salaries if this limit did not exist.

As to whether or not the top players or even the players as a whole are better off or worse off for having a union, that's a horse of a different color. My gut feeling is that both classes are better off.