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?
正确的思维行为是来自于因果规律（或无论其他什么规律）的纯粹效用性；对这种说法的证明在哪里？
Where on earth is the proof that the pure operation of these laws (or any other laws) would yield correct laws of thinking?
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