Privity is the legal term for a close, mutual, or successive relationship to the same right of property or the power to enforce a promise or warranty. It is an important concept in contract law.
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Contract law
The principle of privity in the common law's law of contract dictates that persons may not reap the benefits nor suffer the burdens of a contract to which they were not a party. Under the doctrine, if a consumer bought goods from a retailer who had originally bought them from the manufacturer, then, if the goods proved faulty, the consumer should sue the retailer. The consumer could not sue the manufacturer in contract law because no contract existed between them. The retailer could then counterclaim against the manufacturer. In most cases, however, consumes may rely on the manufacturer's guarantee that will have been assigned to them.
In England, the leading privity case was Tweddle v Atkinson, but this case immediately revealed the limits (and indeed the stupidity) of the doctrine and two Law Commission reports proposed reform. Finally, English law was amended by the Contracts (Rights of Third Parties) Act 1999, which allows non-party beneficiaries of a contract to enforce the contract, thereby effectively abolishing the doctrine.
US federal law
In the US federal law of res judicata, privity is said to preclude a party to a legal action from raising an issue that either was raised or could have been raised in previous legal action. Under federal law, "concepts summarized by the term privity are looked to as a means of determining whether the interests of the party against whom claim preclusion is asserted were represented in prior litigation." Therefore, privity in federal common law is "a convenient means of expressing conclusions that are supported by independent analysis." Because privity is actually a term to summarize a conclusion that one party was precluded, it "may exist for the purpose of determining one legal question but not another depending on the circumstances and legal doctrines at issue."