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Summa Theologiae · II-II, q. 77

Question 77. Of Cheating, Which Is Committed in Buying and Selling

Thomas Aquinas, Summa Theologiae, Second Part of the Second Part. 4 articles.

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Text: Summa Theologiae, Project Gutenberg #18755, Second Part of the Second Part (Secunda Secundae), translated by the Fathers of the English Dominican Province. The Second Part of the Second Part of the Summa in the English Dominican translation (first printed 1911 to 1925; second and revised edition from 1920). A sample check on 2026-11-09 against pre-1931 printings at the Internet Archive (first printings of 1915 and 1916 and the second and revised edition of the 1920s) found that the article text matches, with no 1947 introduction, synopsis, or index. Question and article numbers were added by the transcriber. Rights: Public domain (US)

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We must now consider those sins which relate to voluntary commutations. First, we shall consider cheating, which is committed in buying and selling: secondly, we shall consider usury, which occurs in loans. In connection with the other voluntary commutations no special kind of sin is to be found distinct from rapine and theft.

Under the first head there are four points of inquiry:

(1) Of unjust sales as regards the price; namely, whether it is lawful to sell a thing for more than its worth?

(2) Of unjust sales on the part of the thing sold;

(3) Whether the seller is bound to reveal a fault in the thing sold?

(4) Whether it is lawful in trading to sell a thing at a higher price than was paid for it?

Articles

  1. Whether It Is Lawful to Sell a Thing for More Than Its Worth?
  2. Whether a Sale Is Rendered Unlawful Through a Fault in the Thing Sold?
  3. Whether the Seller Is Bound to State the Defects of the Thing Sold?
  4. Whether, in Trading, It Is Lawful to Sell a Thing at a Higher Price Than What Was Paid for It?

Also online, linked only: the same translation at New Advent and the Latin text at Corpus Thomisticum. Neither is copied here.

Source: Thomas Aquinas. Summa Theologica, Second Part of the Second Part. Project Gutenberg #18755. Project Gutenberg record. Public domain in the USA. Outside the U.S., check local copyright rules. Project Gutenberg notices retained. The full Project Gutenberg license is kept in the hosted text.