An increase in a firm’s marginal cost can raise its profit
在古诺行业中，当竞争对手成本不变时，企业边际成本上升反而可能增加其利润，这需要利润边际随边际成本递增且对手产出为战略互补，例如需求价格弹性小于1的寡头垄断市场。
A firm in a Cournot industry can benefit from an increase in its marginal cost while its rivals’ costs are unchanged. This requires the firm’s profit margin to be increasing in its marginal cost and outputs to be strategic complements for the rivals. The margin increases if inverse demand curvature exceeds the number of firms. The main examples have demand functions with constant price elasticities below 1 and a duopoly.