Then, tracing to its source, explains the economics theoretical foundation of the consumer credit, that is, time-favor theory, life-cycle hypothesis and permanent-income theory.

而后追根溯源，阐释了消费信贷的经济学理论基础，即时间偏好理论、生命周期假说和持久性收入假说。

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The company enjoys many users 'credit by depending on short cycle, high precision, long service life, and thoughtful service.

公司生产的模具以周期短、精度高、使用寿命长、服务周到而得到广大用户的信任。

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