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> ... monopoly ... players.

Crucially, the "mono-" bit means "one." One seller.

1 < n ⪅ 5 is "oligopoly".

If they collude and conspire it's a "cartel", but technically a cartel can also be a subset of players in a "polyopoly" (which is "many sellers", i.e. a healthy market). It's just way easier if the cartel = everyone :)




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