It succeeds in improving the efficiency of the economic activities , in the respect of the choice of the exchange objects , the decrease in cost , realization of the commodity values , the launch of credit consumption and social investments , etc . at last , the paper draws a conclusion that honesty and keeping promise not only has the moral values but also has the economic values 从交易对象的选择、交易费用的降低、商品价值的实现、信用消费的启动、社会投资等方面看，诚信使经济活动效率提高。最后，诚信不仅具有伦理价值而且具有经济价值，是伦理价值和经济价值的辩证统一。第三部分是诚信问题研究的实践意义。
The second is to define which thoughts of the theory are permanent , without changing along with the time , such thoughts , which are unavoidable in persisting in and developing the theory , are as follows : the abstract labor is the only source of the invention of value ; the simple labor and complex labor should be distinguished ; the concept " general worker " should be hold ; the necessary labor determines commodity value ; use value is the deposit of value 其次，必须明确马克思劳动价值论的哪些内容是不会随时代的变化而变化从而是我们必须坚持的，这些问题也是坚持和发展马克思劳动价值论不能回避的核心问题。文章认为：必须坚持抽象劳动始终是价值的唯一源泉的思想；必须坚持社会必要劳动时间决定商品价值量的思想；必须坚持简单劳动和复杂劳动划分及其相互换算的思想；必须坚持“总体工人”的思想；必须坚持使用价值只是价值物质承担者的思想等等。
