Notes on the Journal of Industrial Economics Website http://www.essex.ac.uk/jindec/
指出，即使总产出不变，垄断性三级价格歧视也必然降低社会福利，与Adachi（2002）的结论相反。
It is known that monopolistic third-degree price discrimination decreases aggregate welfare if total output falls. In contrast to Adachi (this Journal, 2002), this note shows that welfare must decrease under price discrimination even if total output remains constant