When it comes to choice, classical economics leaps to the punch line and works backwards : if both Betty Sue and Sally ANN are willing to marry you and you chose Betty Sue, the economist can only conclude that you preferred Betty Sue. 谈到选择,古典经济学会跳到关键问题,然后反向推导:如果贝蒂苏(bettysue)和萨利安(sallyann)都愿意嫁给你,而你选择了贝蒂,经济学家只能得出结论说,你更喜欢贝蒂。