Mont. Code § 30-1-103 : TRADE AND COMMERCE — UNIFORM COMMERCIAL CODE GENERAL PROVISIONS — SHORT TITLE, CONSTRUCTION, APPLICATION, AND SUBJECT MATTER OF THE CODE —1-103 - Supplementary general principles of law applicable

Unless displaced by the particular provisions of this code, the principles of law and equity, including the law merchant and the law relative to capacity to contract, principal and agent, estoppel, fraud, misrepresentation, duress, coercion, mistake, bankruptcy, or other validating or invalidating cause shall supplement its provisions.