The economically useful way to model a person is to treat him as a purposeful, goal-seeking agent with pleasures and pains, desires and intentions, guilt, blame-worthiness.
经济有效地对一个人建模的方法是 把他当做一个有目的的人， 这个人有着愉悦和痛苦、欲望和企图、 内疚、自责这些人格特性。