You should see that the blue line is better than the pink line because, for any expected return, the blue line is to the left of the pink line, right?

可以看到蓝线比粉线好,原因是对于任意的预期收益率，蓝线都在粉线的左边，对吧？

耶鲁公开课 - 金融市场课程节选