laishicheng09 发表于 2010-2-5 16:37 
理论上应有第一价格歧视可以实现楼上的“总的社会福利没有损失”,但要做到第一价格歧视现实是不可能的,比如各个人的偏好不同,垄断企业如何得知每个人的偏好,就是能得到那成本也是N大,所以小弟认为不能。
if you think the first price discrimination is valid theoretically based on certain assumptions, you would feel more comfortable.
To be sure, economic theory meets our real world on by chance.
可以看一下《卖橘者言》