The receipt of a benefit by someone without just cause, at the expense of another, constitutes a legal wrong where the recipient should, in fairness, return the benefit. For example, a contractor mistakenly paves the wrong driveway, significantly increasing the property value. The homeowner receives a clear advantage, though not requested, at the contractor’s detriment.
This principle serves as a foundation of fairness in legal systems, preventing individuals from unfairly retaining advantages gained through mistake, coercion, or other inequitable circumstances. Its historical roots trace back to Roman law, demonstrating its enduring importance in maintaining equitable economic interactions and deterring exploitative behavior.
