Product liability is the branch of tort and consumer-protection law that holds parties in the chain of commerce accountable when a product causes harm to a user, consumer, or bystander. Claims typically rest on one or more of three theories: negligence (failure to exercise reasonable care in design, manufacture, or warning), breach of warranty (violation of express or implied promises about the product, such as merchantability or fitness for a particular purpose), and strict liability (responsibility without proof of fault if the product was defective and the defect caused the injury).
Defects generally fall into three categories: manufacturing defects (the product departs from its intended design), design defects (the design itself is unreasonably dangerous, often assessed via a risk-utility or consumer-expectations test), and warning or marketing defects (inadequate instructions or failure to warn of foreseeable risks).
In the United States, strict product liability was crystallised in the California Supreme Court decision Greenman v. Yuba Power Products (1963) and later incorporated into the Restatement (Second) of Torts §402A (1965) and the Restatement (Third) of Torts: Products Liability (1998). In the European Union, the Product Liability Directive 85/374/EEC harmonised member-state rules around a no-fault regime for defective products; it was replaced by a modernised directive adopted in 2024 to address software, AI systems, and digital products.
For international affairs and Model UN contexts, product liability intersects with trade law (technical barriers, conformity assessment under the WTO TBT Agreement), consumer protection (UN Guidelines for Consumer Protection, last revised 2015), and emerging debates on liability for artificial intelligence, pharmaceuticals, and cross-border e-commerce. Jurisdictional questions—which country's law applies when a product manufactured in one state injures a consumer in another—are governed by private international law instruments such as the Hague Convention on the Law Applicable to Products Liability (1973).
Damages recoverable typically include medical expenses, lost income, pain and suffering, and, in some jurisdictions, punitive damages.
Example
In 2014, General Motors recalled roughly 2.6 million vehicles over a defective ignition switch linked to multiple deaths, leading to a US$900 million deferred-prosecution settlement with the U.S. Department of Justice and extensive product-liability litigation.
Frequently asked questions
Negligence requires proving the defendant failed to exercise reasonable care, while strict product liability allows recovery on proof of a defect and causation alone, regardless of the manufacturer's care.
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