两种意义的社会必要劳动时间各有其质和量的不同规定。第一种涵义的社会必要劳动时间决定价值和价值量．而且是决定商品的社会价值量，不是决定商品的个别价值。第二种涵义的社会必要劳动时间不决定商品的社会价值，而是决定商品实现的社会价值。作为价值决定的前提的使用价值是指能满足人们的某种需要，作为某种商品总量价值实现的前提的使用价值是指满足有支付能力的社会需要量。《资本论》第一卷和第三卷都同时考察了两种涵义的社会必要劳动时间。 The two types of socially necessary working hours each have different provisions of quality and quantity. The first implication of socially necessary working time determines the value and value. But also determine the amount of social value of goods, not to determine the individual value of the goods. The second implication of socially necessary working time does not determine the social value of goods, but the social value of the goods. Use value, which is the premise of value determination, refers to the value that can meet people’s needs. The use value as a precondition to realize the total value of a commodity refers to the social requirement to meet the affordability. The first volume and the third volume of “Capitalism” both examined the social meaning of the two meanings of labor time.