(a) This Title shall be liberally construed and applied to promote its underlying purposes and policies, which are:
(1) to simplify, clarify, and modernize the law governing commercial transactions;
(2) to permit the continued expansion of commercial practices through custom, usage, and agreement of the parties; and
(3) to promote uniformity of the law among the various jurisdictions.
(b) Unless displaced by the particular provisions of this Title, the other laws of Louisiana supplement its provisions.