哈佛大学：《中级微观经济学》（英文版）Lecture 11 Competition and monopoly, some preliminary discussions

This also helps to explain large differences across airline flights or time of day entries Probably we should be more puzzled by the fact that prices vary little as opposed to the fact that prices vary a lot Another way to address this is a tie in Assume that there are two goods and 1/2 of the people value each good highly(with value v)and 1/2 of the people value each good much less (with value y The correlation term is denoted o. so there are5o high-high types and 5o low-low types

This also helps to explain large differences across airline flights or time of day entries. Probably we should be more puzzled by the fact that prices vary little as opposed to the fact that prices vary a lot. Another way to address this is a tie in. Assume that there are two goods and 1/2 of the people value each good highly (with value v) and 1/2 of the people value each good much less (with value v) The correlation term is denoted , so there are .5 high-high types and .5 low-low types

If each good is owned by a separate monopoly, the monopolist will each charge y and each y-c or charge v and earn 5(-c)

If each good is owned by a separate monopoly, the monopolist will each charge v and each vc or charge v and earn . 5v  c