Social mobility
Definition: the ability to move to a higher social status.
Ex: This topic is talking about social mobility in the USA.
to rule out
Definition: to exclude or prevent someone from doing something.Ex: Due to this criteria, it rules out a lot of candidate.
#Opinion
Working for free, I think that is based on how much you want to get into this company or learn things from it.
My perspective is that companies still need to pay for an internship, because the intern also works hard and put efforts in companies whether they have experience or not.
At the end, a good company should have respect each other who work for a company and treat them as the same.