一、效用理论效用本是资产阶级古典经济学的一个基本概念，用以表示商品对消费者所起的作用。效用不仅具有定性的意义，如饭有“充饥”的效用．茶有“止渴”的效用。而且它还有定己的含义．起作用大的效用就大．起作用小的效用就小。比如人在口渴的时候，第一杯茶的效用就很大 First, the utility of utility theory This is a basic concept of bourgeois classical economics, to represent the role of goods to consumers. Utility not only has a qualitative meaning, such as rice has “hungry” utility. Tea has a “thirst quencher” effect. And it still has its own meaning. Great effect on the big role. Little effect on the role of small. For example, when people are thirsty, the effectiveness of the first cup of tea is great