Adam Smith：The Wealth of Nations, Book IV, Chapter IX, Paragraph 1590

The sovereigns of China, of ancient Egypt, and of the different kingdoms into which Indostan has, at different times, been divided, have always derived the whole, or by far the most considerable part, of their revenue, from some sort of land tax or land rent. This land tax, or land rent, like the tithe in Europe, consisted in a certain proportion, a fifth, it is said, of the produce of the land, which was either delivered in kind, or paid in money, according to a certain valuation, and which, therefore, varied from year to year, according to all the variations of the produce. It was natural, therefore, that the sovereigns of those countries should be particularly attentive to the interests of agriculture, upon the prosperity or declension of which immediately depended the yearly increase or diminution of their own revenue.

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Locator：Book IV, Chapter IX, paragraph 1590 · Verified：2026-10-19 · Verification：Exact match

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