LII [Legal Information Institute]: Commercial LawCommercial law governs the broad areas of business, commerce, and consumer transactions. Specific law has developed in a number of commercial fields. These include: Banking, Bankruptcy, Consumer credit, Contracts, Debtor and creditor, Landlord-tenant, Mortgages, Negotiable instruments, Real estate transactions, Sales, and Secured transactions. Here, you'll also find the The Uniform Commercial Code, which has been substantially adopted as statutory law in nearly every state, governs numerous areas of commercial law.