Louisiana Civil Code Tit. IV, Art. 2055. Equity and usage

Equity, as intended in the preceding articles, is based on the principles that no one is allowed to take unfair advantage of another and that no one is allowed to enrich himself unjustly at the expense of another.

Usage, as intended in the preceding articles, is a practice regularly observed in affairs of a nature identical or similar to the object of a contract subject to interpretation.