Happiness is not something ready made. It comes from your own actions.
I don't need a reason to be proud of myself.
柠檬问题发生的原因是卖家比买家更了解产品,从而导致市场失灵。
最强大的人永远不足以始终成为主宰,除非他将力量变为权力,服从变为义务。