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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?
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