亚当·斯密：国富论·第V篇第I章·第1689段

The third and last duty of the sovereign or commonwealth, is that of erecting and maintaining those public institutions and those public works, which though they may be in the highest degree advantageous to a great society, are, however, of such a nature, that the profit could never repay the expense to any individual, or small number of individuals; and which it, therefore, cannot be expected that any individual, or small number of individuals, should erect or maintain. The performance of this duty requires, too, very different degrees of expense in the different periods of society.

出处： https://www.gutenberg.org/ebooks/3300
定位：Book V, Chapter I, paragraph 1689 · 核对日期：2026-10-19 · 核验：逐字核对

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