But how much more than the standard retail price would individuals pay to keep these “must-have” products? Likewise, what is the value to patients of laparoscopic surgery or drugs that relieve anxiety or prevent heart attacks?
而将新事物计算在内的难度则更大。基本上我们身边的每一个人都有智能手机，笔记本电脑和平板电脑。我们知道购置这些东西要花多少钱以及它们对名义GDP总值的贡献。但人们在这些基本零售价之外还为这些“必需”品支付了多少钱？同样，腹腔镜手术或者服用抗抑郁/预防心脏病药物对病人的价值是否也计算了在内？