马克思说:“经济范畴只不过是社会关系的理论表现,即其抽象。”又说,“人们按照自己的物质生产的发展建立相应的社会关系,正是这些人又按照自己的社会关系创造了相应的原理、观念和范畴。”“这些观念、范畴也同它们所表现的关系一样,不是永恒的。它们是历史的暂时的产物。”(以上均见《马克思恩格斯全 Marx said: “The economic category is nothing more than the theoretical expression of social relations, that is, its abstraction.” It goes on to say that “people set up social relations in accordance with their own material production and development. It is these people who follow their own social The relations create the corresponding principles, ideas, and categories. ”“ These concepts, categories, like the relationships they present, are not eternal, they are temporary products of history. ”(See above," The Complete Works of Marx and Engels