Quite often what's observed in industries that are highly concentrated is that rather than competing vigorously, companies adopt a policy, either explicitly or implicitly, of co-operating rather than competing with their competitors.
En effet, bien souvent, on remarque au sein des industries à forte concentration que, plutôt que de se livrer une concurrence vigoureuse, les entreprises adoptent une politique soit explicite, soit implicite de coopération.