Products Liability
Products liability -- the legal responsibility of manufacturers and sellers for injuries caused by defective products -- has undergone one of the most dramatic doctrinal evolutions in all of tort law. The journey from a regime of caveat emptor ('let the buyer beware'), through negligence with its privity requirement, to strict liability regardless of fault represents a fundamental shift in how the legal system allocates the costs of product-related injuries. This evolution reflects changing economic realities, evolving understandings of risk distribution, and the increasing complexity and opacity of manufactured goods.
For most of legal history, injured consumers had no recourse against manufacturers. The privity requirement -- the rule that only parties to a contract could sue for breach -- meant that a consumer who purchased a product from a retailer could not sue the manufacturer, even if the manufacturer's negligence caused the defect. This barrier began to erode in the early twentieth century, as courts recognized exceptions for inherently dangerous products and eventually abolished the privity requirement altogether for negligence claims.
The real revolution came in the 1960s with the adoption of strict products liability, which holds manufacturers liable for injuries caused by defective products regardless of the manufacturer's care or fault. Justice Traynor's concurrence in Escola v. Coca-Cola and his later majority opinion in Greenman v. Yuba Power Products articulated the policy rationale: manufacturers are in the best position to prevent defects, to absorb and distribute the costs of injuries through insurance and pricing, and consumers reasonably expect that products placed on the market are safe. The Restatement (Second) of Torts Section 402A codified this approach, and it was adopted by virtually every American jurisdiction.
Timeline
MacPherson v. Buick Motor Co.→
Justice Cardozo eliminated the privity requirement for negligence claims against manufacturers, holding that a manufacturer owes a duty of care to all foreseeable users of its products, not just the immediate purchaser. The decision transformed products liability from a contract-based regime into a tort-based one, opening the courthouse doors to injured consumers for the first time.
Escola v. Coca-Cola Bottling→
While the majority applied res ipsa loquitur to a case involving an exploding Coca-Cola bottle, Justice Traynor's influential concurrence argued for strict liability for defective products. Traynor's reasoning -- that manufacturers can best bear the costs of injuries and consumers rely on the manufacturer's implied representation of safety -- laid the intellectual foundation for the strict liability revolution.
Greenman v. Yuba Power Products→
Justice Traynor, now writing for the majority, formally adopted strict liability in tort for defective products. The California Supreme Court held that a manufacturer is strictly liable when it places a defective product on the market knowing it will be used without inspection. Greenman became the catalyst for nationwide adoption of strict products liability.
Restatement (Second) of Torts Section 402A
The American Law Institute adopted Section 402A, imposing strict liability on sellers of products in a defective condition unreasonably dangerous to the consumer. This Restatement provision was adopted by virtually every American jurisdiction and became the uniform framework for products liability law, standardizing the doctrine across the country.
Sindell v. Abbott Laboratories→
Created the 'market share liability' theory for cases where the plaintiff cannot identify the specific manufacturer of the product that caused the injury. In the DES cases, where multiple manufacturers produced identical drugs, the California Supreme Court held each manufacturer liable for its proportional share of the market. The decision pushed products liability to its outer boundaries of causation doctrine.
Summers v. Tice→
Established alternative liability theory, shifting the burden of proof on causation to defendants when two negligent actors caused harm but only one could have been the actual cause. This burden-shifting approach influenced the later development of market share liability and relaxed causation requirements in products liability cases involving indeterminate defendants.
Current State of the Law
Modern products liability recognizes three types of defects: manufacturing defects (the product departs from its intended design), design defects (the entire product line is unreasonably dangerous), and failure-to-warn defects (the product lacks adequate instructions or warnings). The Restatement (Third) of Torts: Products Liability (1998) refined the framework, retaining strict liability for manufacturing defects but applying a risk-utility test (essentially a negligence standard) for design and warning defects. Most jurisdictions have adopted some version of this approach, though the precise standards vary.
Products liability litigation continues to be a major component of the civil justice system, with ongoing mass tort litigation involving pharmaceuticals, medical devices, chemicals, and consumer products. Federal multidistrict litigation (MDL) has become the dominant procedural vehicle for aggregating products liability claims.
Future Outlook
Emerging products liability issues include liability for defective artificial intelligence systems, autonomous vehicles, and software-driven products. Traditional products liability doctrine, developed for physical manufactured goods, may require adaptation for products whose 'defects' involve algorithmic errors, training data biases, or cybersecurity vulnerabilities. Whether AI systems constitute 'products' subject to strict liability or 'services' subject to negligence standards is an open question with enormous practical implications.
The globalization of supply chains raises jurisdictional and choice-of-law complications, as components manufactured in multiple countries are assembled into final products sold worldwide. Climate change litigation has also intersected with products liability theory, with plaintiffs pursuing claims against fossil fuel companies for the alleged defective design of their products. These novel applications will test the boundaries and adaptability of products liability doctrine.