I would go with the english were not concerned with height.
Answer: POLARIZATION.
Explanation: The simplest definition of polarization is the grouping of opinions into two extremes. Some factors that propagate polarization in the society include income inequality, real-estate fluctuations, economic displacements etc. This opinions are so different that it often causes disagreement breaks out, fueling attacks and controversy.
Stimulus generalization this would be your answer I hope this helped.
North and South Korea maybe?
Explanation:
I believe the answer is Oligopoly.
Oligopoly refers to the market where all products is made by small number of producers/Sellers.
In current united States movie industries, the majority of the most profitable movies are controlled by only 6 Companies.