劳动并不创造物品，而是创造效用。
本文从个体效用最大化策略的个体出发，建立模型分析在多轮重复博弈情况下个体对公共物品的私人供给水平。
In this paper, we will depart from the individual strategy of utility maximum, and analyze the private provision level of public goods in the repeated game through modeling.
药性，药效药品的特点成性质，尤指那些使具有医疗效用的物品。
The characteristics or properties of a drug, especially those that make it medically effective.
所以，萨伊先生和其他人问得好：既然说生产物品时，生产的只不过是效用，那为什么不把所有产生效用的劳动都看作是生产性的呢？
It is, therefore, pertinently asked by M. Say and others-since, when we are said to produce objects, we only produce utility, why should not all Labour which produces utility be accounted productive?
所以，萨伊先生和其他人问得好：既然说生产物品时，生产的只不过是效用，那为什么不把所有产生效用的劳动都看作是生产性的呢？
It is, therefore, pertinently asked by M. Say and others-since, when we are said to produce objects, we only produce utility, why should not all Labour which produces utility be accounted productive?
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