I want to know the impact of labor unions on economies from both the
employers and the employees perspectives.  The answer should be based
in economic theory or, failing that, empirical evidence.  I'm mostly
concerned with whatever economic theories you can dig up that are
applicable to this question, but any empirical evidence to support any
of your findings would be good as well.  I'd advise looking
specifically at the field of labor economics, but the other fields
might be helpful as well.  I want a detailed answer, involving multiple
economic theories, preferably with some empirical evidence.  If you
need any more information don't hesitate to contact me.