Douglas Harper's Etymology Dictionary
Wiktionary
oligopolistic
a. Having the character of, or dominated by, an oligopoly
Usage examples of "oligopolistic".
In political terms, the global information infrastructure might be characterized as the combination of a democratic mechanism and an oligopolistic mechanism, which operate along different models of network systems.
The oligopolistic network model is characterized by broadcast systems.
This oligopolistic model is not a rhizome but a tree structure that subordinates all of the branches to the central root.