Trading

The Prohibition against Trading.—(a) Meaning.—Trading as here understood is purely gainful merchandizing (i.e., buying an article at a lower price in order to sell it unchanged at a higher price) or industrial merchandizing (i.e., buying an article in order to sell it at a profit after it has been changed by hired labor). Hence, there is no canonical trading in commerce which lacks one of the conditions mentioned, for example, if one buys goods for one’s household or community and, on discovering that a superfluity has been purchased, sells at a profit what is left over (see 2134, 2135). Trading includes not only a business conducted personally or for personal profit, but also one conducted through agents or for the benefit of others, such as the poor or pious causes.

(b) Obligation.—The violation of this law is grave in itself, but a serious sin demands on the part of the subject that there be real trading (i.e., a number of acts morally united and proceeding from a purpose to continue in lucrative merchandizing), and on the side of the object that there be a large amount involved. Hence, it would be venial to engage in lucrative trading with a large profit once, and with a small profit twice or thrice.

(c) Excuses.—Necessity (e.g., if a cleric needs the money to live or to maintain his state, or if a business has fallen to him by inheritance and cannot be given up without loss) justifies trading, if there is permission.