柠檬问题是指买家无法确定产品质量，因此只愿意支付反映平均质量的价格。

I don't care what you think about me, I don't think about you at all.

A man, as a general rule, owes very little to what he is born with – a man is what he makes of himself.

个人投资者应该始终如一地作为投资者而不是投机者行事。

个愚蠢的人知道自己的愚蠢，这使他至少是聪明的。一位愚蠢的人以为自己聪明，这才是真正的愚蠢。