A Depiction of a dystopian Capitalism
Not sure if capitalism is the right system to compare this movie to, socialism is probably a better choice. The people are trapped in this weird underground place, which is similar to how socialism works, by trapping the people inside (Berlin wall, Cuba, Venezuela, and the incredibly expensive way for citizens to obtain passports even though they are all poor).
Not only they are trapped, but the amount of food is fixed and determined by the elites. In capitalism, the amount of food would vary and would be determined by demand.
But either way, I loved the film and this dystopian place was very shocking to watch. Super original and entertaining.
You could also compare it with trickle down economy, human behavior in capitalism.
You make valid points though, thanks i didn't think of socialism