This document summarizes key points from a business law textbook chapter on illegal contracts. It describes how contracts can be considered illegal if they involve criminal plans, violate public policy, or contravene statutes. Specific illegal agreements discussed include gambling, usurious interest rates, and restraint of trade. The summary also examines how courts may treat the parties in illegal contracts differently depending on common law versus the Uniform Commercial Code. Under common law, courts generally refuse to enforce illegal contracts or help either party. However, there are some exceptions like if one party was protected or excusably ignorant. The UCC also considers unconscionable contracts unenforceable.