Even if marginal gain of the newspaper firm which has certain market power in the advertisement market is equal to the marginal cost in advertisement market, marginal gain of the newspaper firm in circulation market may be smaller than the marginal cost i
Even if marginal gain of the newspaper firm which has certain market power in the advertisement market is equal to the marginal cost in advertisement market, marginal gain of the newspaper firm in circulation market may be smaller than the marginal cost i
即使具备市场势力的报业厂商在广告市场的边际收益等于其在广告市场的边际成本，但是，不需要任何条件，报业厂商在发行市场的边际收益小于其在发行市场的边际成本；若具备一定条件，甚至连报业厂商的发行价格也小于其在发行市场的边际成本。