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The best economic insights come from observing how people actually behave.

Mathematical intuition is like a muscle - it grows stronger with exercise.

Identity capital is our collection of personal assets. It is the repertoire of individual resources that we assemble over time. These are the investments we make in ourselves, the things we do well enough, or long enough, that they become a part of who we are.

說話有分寸則少得罪人；行為有節(jié)制則少悔恨；愛慕有節(jié)制則要求少；快樂有節(jié)制則禍敗少；飲食有節(jié)制則疾病少。