请问这道题怎么理解

问题如下：

Question Assume that two firms in a duopoly enter into a collusive agreement in an attempt to form a cartel and restrict output, raise prices, and increase profits. According to the Nash equilibrium, a low price is most likely charged by:

选项：

A.only one firm. B.both firms. C.neither firm.

解释：

Solution

C is correct. The market outcomes for two firms in a duopoly is shown in the diagram. The lower left hand quadrant is the Nash solution when there is no collusion. However, with collusion, if ArcCo shares at least enough of its profit in the bottom right quadrant to provide BatCo more than it would receive in the lower left, it will be the optimal solution for the pair: the maximum joint profits will arise where both firms charge high prices for the product.

B is incorrect; as per the explanation and exhibit above.

A is incorrect; as per the explanation and exhibit above.

中文解析：

C正确。双寡头垄断中两家公司的市场结果如图所示。左下象限是没有共谋时的纳什解。然而，在共谋的情况下，如果ArcCo在右下象限分享至少足够的利润，以向BatCo提供比左下象限更多的利润，这将是对这对公司的最优解决方案:当两家公司都对产品收取高价格时，将出现最大的共同利润。

B是不正确的;根据上面的解释和展示。

A不正确;根据上面的解释和展示