It is known as cartel.
A cartel is a group of separate firms or organizations that band together to fix the price of a product or service. Cartels compete in the same industry and strive to minimize competition by setting prices in accordance with one another.
Cartels employ tactics such as supply reduction, price fixing, collusive bidding, and market carving. Cartels are regarded unlawful and advocates of anti-competitive behavior in the majority of regions. Cartel actions typically harm customers through rising pricing and a lack of transparency.
Therefore, the answer is cartel that creates monopoly.
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