--- title: "Greenman v. Yuba Power Products, Inc." type: Landmark Case source: https://casebriefly.com/landmark-cases/greenman-v-yuba-power-products --- # Greenman v. Yuba Power Products, Inc. Greenman is the landmark case that formally established strict products liability in American tort law. Justice Traynor, writing for the court, held that a manufacturer is strictly liable when it places a defective product on the market knowing it will be used without inspection. This case triggered a nationwide revolution in products liability law and led directly to the adoption of Restatement (Second) Section 402A. ## Citation 59 Cal. 2d 57, 377 P.2d 897 (1963) ## Year 1963 ## Court Supreme Court of California ## Facts William Greenman received a Shopsmith combination power tool as a gift from his wife. He used it as a lathe to make a chalice, and after using it several times, a piece of wood flew out of the machine and struck him in the forehead, causing serious injuries. Evidence showed that the set screws holding the tool's components were inadequate, making the tool defective. ## Procedural History The trial court entered judgment for the plaintiff against both the retailer and the manufacturer. The Supreme Court of California affirmed the judgment against the manufacturer on strict liability grounds, rejecting the defendant's argument that the plaintiff had failed to give timely notice as required under breach of warranty. ## Issue Whether a manufacturer is strictly liable in tort for injuries caused by a defective product, without requiring the plaintiff to prove negligence or to comply with the notice requirements of warranty law. ## Holding The court held that a manufacturer is strictly liable in tort when an article it places on the market, knowing that it is to be used without inspection for defects, proves to have a defect that causes injury to a human being. The plaintiff need not prove negligence and need not comply with warranty notice requirements. The liability is based in tort, not contract. ## Reasoning Justice Traynor, fulfilling the vision of his Escola concurrence, reasoned that the purpose of strict liability is to ensure that the costs of injuries resulting from defective products are borne by the manufacturers who put those products on the market rather than by the injured persons who are powerless to protect themselves. He rejected the contract-based warranty framework as inadequate, noting that warranty law's notice requirements and privity limitations created unjust barriers to recovery. The court grounded liability in tort principles, making it clear that the manufacturer's duty runs to all foreseeable users, not just those in privity of contract. ## Impact Greenman triggered one of the most rapid doctrinal shifts in American legal history. Within a few years, the American Law Institute adopted Section 402A of the Restatement (Second) of Torts, imposing strict liability on sellers of defective products. Nearly every American jurisdiction adopted some form of strict products liability. The case fundamentally changed the relationship between manufacturers, consumers, and the tort system, creating the modern products liability regime. ## Key Quotes - A manufacturer is strictly liable in tort when an article he places on the market, knowing that it is to be used without inspection for defects, proves to have a defect that causes injury to a human being. - The purpose of such liability is to insure that the costs of injuries resulting from defective products are borne by the manufacturers that put such products on the market rather than by the injured persons who are powerless to protect themselves. - To establish the manufacturer's liability it was sufficient that plaintiff proved that he was injured while using the Shopsmith in a way it was intended to be used as a result of a defect in design and manufacture of which plaintiff was not aware. ## Related Cases - escola-v-coca-cola-bottling - macpherson-v-buick-motor-co - sindell-v-abbott-laboratories - rylands-v-fletcher ## Exam Relevance Greenman is essential for products liability questions on exams. Students should be prepared to explain the elements of strict products liability, distinguish it from negligence and warranty theories, and discuss the policy rationale for imposing liability without fault on manufacturers. ## Study Tips - Know the key holding: strict liability requires only that the product was defective and that the defect caused the plaintiff's injury — no proof of negligence is needed. - Understand why the court grounded liability in tort rather than contract — to avoid the privity and notice requirements of warranty law. - Trace the doctrinal development from MacPherson to Escola to Greenman to understand the evolution of products liability. - Be prepared to discuss the three types of product defects: manufacturing defects, design defects, and failure to warn. ## Doctrine Established Strict Products Liability --- Source: [Greenman v. Yuba Power Products, Inc. — CaseBriefly](https://casebriefly.com/landmark-cases/greenman-v-yuba-power-products)