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 the provisions of this chapter. (Added 1995, No. 179 (Adj. Sess.), § 14; amended 2017, No. 20, § 1.)