The capital asset pricing model was not intended to be a positive theory of what investors actually do, but rather a normative theory of what rational investors should do.
资本资产定价模型并非旨在描述投资者实际行为的实证理论，而是关于理性投资者应如何行事的规范理论。
I'm not a rapper, I'm a hustler who raps.
The mind is the most important thing in tennis.
She walks in beauty like the night,Of cloudless climes and starry skies;All that's best of dark and bright，Meet in her aspect and her eyes.
I don't believe in anything, and that's the only thing I believe in.
I would rather be right than consistent.