Unless displaced by the provisions of this chapter, the principles of law and equity, including the law merchant and the law relating to principal and agent, estoppel, laches, fraud, misrepresentation, duress, coercion, mistake, insolvency, or other validating or invalidating cause, supplement its provisions.
Tex. Bus. and Comm. Code § 24.011
Amended by Acts 1987, 70th Leg., ch. 1004, Sec. 1, eff. 9/1/1987.