Adam Smith：The Wealth of Nations, Book IV, Chapter V, Paragraph 1231

The average quantity of all sorts of grain exported from Great Britain does not, according to the same author, exceed the one-and-thirtieth part of the annual produce. For the encouragement of tillage, therefore, by providing a market for the home produce, the importance of the inland trade must be to that of the exportation trade as thirty to one.

Source： https://www.gutenberg.org/ebooks/3300
Locator：Book IV, Chapter V, paragraph 1231 · Verified：2026-10-19 · Verification：Exact match

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