The value of commodities is determined by the socially necessary labor time. Only when the individual labor time is lower than the socially necessary labor time can commodity producers make money, and the greater the range, the more they can make money, so time is money.

Use value is the material undertaker of value. Only by paying attention to the quality of products can commodity producers ensure the realization of value. According to the principle of high quality and good price, only by paying attention to product quality can products sell well and win in the market competition. Therefore, quality is life.

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