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1·Collusive oligopoly: oligopoly where participants act as a cartel.

勾结性垄断：参与并作为一个卡特尔行事的垄断行为。

2·Cartel was an important collusive way of firms in the oligopoly market.

卡特尔是寡头垄断市场中厂商的一种重要勾结形式。