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Uniform Commercial Code (UCC): Primary source of commercial law in the US, particularly Article 2 which governs sales of goods and contract modifications. Essential for amendments to purchase agreements involving goods.

State Contract Laws: State-specific contract laws and common law principles that govern contract formation, modification, and enforcement within each jurisdiction.

Statute of Frauds: Legal principle requiring certain types of contracts and their modifications to be in writing and signed to be enforceable.

Federal Trade Commission Regulations: Federal regulations governing commercial practices, consumer protection, and fair trade practices that may affect purchase agreement terms.

State Consumer Protection Laws: State-specific laws designed to protect consumers from unfair practices and ensure transparent business transactions.

Truth in Lending Act: Federal law requiring disclosure of key terms and costs in consumer credit transactions, relevant if financing is part of the purchase agreement.

Property Laws: State and federal laws governing the transfer of real and personal property, including specific requirements for property transactions.

Securities Laws: Federal and state laws governing the sale of securities, including the Securities Act of 1933 and Securities Exchange Act of 1934, if the purchase involves investment instruments.

Antitrust Laws: Federal laws including Sherman Act, Clayton Act, and FTC Act that regulate competition and prevent monopolistic practices in business transactions.

Electronic Signatures Legislation: E-SIGN Act and UETA governing the validity and enforceability of electronic signatures and records in commercial transactions.