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Key Facts
- State law: Most private contract law comes from state common law and statutes, so a nationwide summary cannot determine the rule in a particular dispute.
- Formation: Common formation questions include mutual assent, consideration or a recognized substitute, capacity, legality, and sufficiently definite terms.
- Writing: Oral and conduct-based agreements can be enforceable, but statutes require signed writings for specified transactions and provide detailed exceptions.
- Remedies: A breach does not automatically produce every requested remedy; contract terms, governing law, proof, causation, foreseeability, and mitigation all matter.
Contract law determines when promises become legally enforceable, what the agreement means, whether performance was sufficient, and what relief may follow a breach. It is a major part of business law, but it also governs everyday transactions between individuals.
Contract law is primarily state law
Most private contract rules come from state court decisions and state statutes. General principles overlap across the country, yet states can define or apply formation, interpretation, defenses, limitation periods, and remedies differently.
The governing law is not always obvious. Relevant facts can include the parties’ locations, place of performance, subject matter, an enforceable choice-of-law clause, and any statute that applies regardless of the contract’s wording.
A contract is more than a promise
Cornell’s Legal Information Institute summarizes the usual formation elements as mutual assent, consideration, capacity, and legality. Mutual assent is commonly analyzed through offer and acceptance, while consideration asks whether the promise was exchanged for something the law recognizes as value.
Those labels are a starting point, not a universal checklist that resolves every case. A jurisdiction may recognize a substitute for consideration, and doctrines such as promissory estoppel can sometimes protect reasonable reliance even when ordinary contract formation is disputed.
Terms also need enough certainty for a court to identify an obligation and remedy. The parties’ words, conduct, prior dealings, transaction context, and applicable default rules may all affect that analysis.
The subject matter changes the governing rules
Common law generally supplies the framework for service and many other private agreements. Sales of goods often fall within a state’s enacted version of the UCC. The Uniform Law Commission describes Article 2 as the sales article, but the model text is not itself a federal statute.
Model UCC section 2-204 illustrates a flexible formation approach for goods: agreement may be shown by conduct, and open terms do not necessarily defeat a contract if the parties intended to contract and there is a reasonably certain basis for a remedy. The relevant state’s enacted wording and case law must be checked before applying that principle.
Not every contract must be on paper
An agreement may be oral, written, electronic, implied from conduct, or formed through a combination of those methods. Whether that agreement is enforceable is a separate question from whether a document exists.
Statutes of frauds require writings for specified categories. California Civil Code section 1624, for example, covers several categories, including agreements that by their terms cannot be performed within one year and agreements for the sale of real property. Its details and exceptions are California-specific.
For goods, model UCC section 2-201 contains a signed-writing rule at a stated price threshold and several qualifications. Because states enact and amend commercial statutes, a model-code dollar amount should not be assumed to be the current operative rule everywhere.
Federal law also matters in some electronic transactions. Under 15 U.S.C. section 7001, a contract or signature in a covered interstate or foreign commerce transaction generally cannot be denied legal effect solely because it is electronic. That rule does not erase other formation requirements or the statute’s exclusions and consumer-disclosure provisions.
Contract terms organize performance and risk
A useful agreement identifies the parties, subject matter, performance standards, price or other exchange, timing, acceptance process, change procedure, termination rights, and allocation of predictable risks. Defined terms and attachments should be consistent with the operative clauses.
Integration, notice, assignment, warranty, indemnity, limitation-of-liability, dispute-resolution, forum, and governing-law clauses can affect a later disagreement. Their presence does not guarantee enforcement; statutes, public policy, clarity, assent, and the transaction’s facts remain relevant.
Breach and remedy are separate questions
A breach occurs when a contractual obligation is not performed as required. The significance of the breach may affect whether the other party can suspend its own performance, terminate, demand cure, or seek relief.
Monetary damages are the usual contract remedy and generally aim to address the proven loss caused by the breach. Reliance or restitution theories may matter in some circumstances, while specific performance is ordinarily reserved for situations in which money is inadequate.
The injured party may also need to take reasonable steps to limit avoidable loss. A liquidated-damages clause can state an agreed amount or formula, but courts can scrutinize whether it operates as compensation or as an unenforceable penalty under the governing law.
Records often decide practical contract disputes
The signed document is only part of the record. Drafts, amendments, purchase orders, invoices, acceptance tests, delivery records, notices, messages, payment history, and evidence of authority or approval can help establish formation and performance.
A focused review compares those records with the exact claim, defense, deadline, and requested remedy under current law. A general description of contract law can frame the issues, but it cannot determine the outcome of a specific agreement.
Sources
- Cornell Legal Information Institute — Contract
- California Legislative Information — Civil Code section 1624
- Uniform Law Commission — Uniform Commercial Code
- Cornell Legal Information Institute — Model UCC section 2-201
- Cornell Legal Information Institute — Model UCC section 2-204
- Office of the Law Revision Counsel — 15 U.S.C. section 7001
- Cornell Legal Information Institute — Breach of contract
