UCC 2-306 is the Uniform Commercial Code provision that makes sales contracts enforceable even when the parties cannot name a fixed quantity at signing. It covers three arrangements: output contracts, where a buyer takes everything the seller produces; requirements contracts, where a seller supplies everything the buyer needs; and exclusive dealing contracts, where one party is the sole supplier or sole distributor of a good. In place of a hard number, the statute uses a good faith obligation, a proportionality limit, and, for exclusive deals, an implied duty of best efforts.1Legal Information Institute. UCC 2-306 – Output, Requirements and Exclusive Dealings
What UCC 2-306 Covers
Section 2-306(1) handles output and requirements contracts. It tells courts that a quantity measured by the seller’s output or the buyer’s requirements is a valid quantity term, provided the parties act in good faith and neither side tenders or demands a quantity unreasonably disproportionate to any stated estimate or to normal prior output or requirements.
Section 2-306(2) handles exclusive dealing. When a lawful agreement makes one party the exclusive source or exclusive outlet for a product, both sides take on an implied obligation to use best efforts — the seller to supply, the buyer to promote sales.
Together, those two subsections let businesses commit to each other without pretending to predict the future, while keeping either party from exploiting the flexibility.
Output Contracts
In an output contract, the buyer agrees to purchase everything the seller produces of a particular good, and the seller commits that entire production to the one buyer. The quantity is whatever the seller’s operations actually generate during the contract term.
The seller gets a guaranteed market. A manufacturer putting money into equipment or raw materials knows every finished unit has a buyer. The buyer locks in the seller’s full capacity, which matters when supply is tight. The trade-off is uncertainty on both ends: the buyer cannot forecast exact costs, and the seller cannot chase a higher bidder if prices spike.
Requirements Contracts
A requirements contract flips the measurement. The seller agrees to supply whatever quantity the buyer legitimately needs to run its business, and the buyer agrees to source that good exclusively from the seller.
For the buyer, that eliminates the risk of over-ordering and warehousing product that may never move. For the seller, it means a reliable recurring customer for the life of the contract. The buyer’s agreement not to shop around is the real sacrifice that gives the contract its mutual commitment. These arrangements are common in seasonal industries, manufacturing supply chains, and any business whose demand swings month to month.
Why These Contracts Are Not Illusory
A standard objection to output and requirements contracts is that they look like illusory promises: one side could set its quantity at zero and walk away. Courts reject that argument, and 2-306’s good faith requirement is the reason. A buyer cannot declare zero requirements to escape the deal, and a seller cannot report zero output to avoid delivery.
The consideration is real on both sides. In a requirements contract, the buyer gives up the freedom to buy the same goods from competitors. In an output contract, the seller gives up the freedom to sell to anyone else. That mutual restriction is what separates these contracts from empty promises.
The Good Faith Limit on Quantity
Good faith under the UCC means honesty in fact and the observance of reasonable commercial standards of fair dealing.2Legal Information Institute. UCC 1-201 – General Definitions In the context of 2-306, that standard polices quantity decisions. A buyer who finds a cheaper supplier cannot suddenly announce zero requirements for the contracted goods. A seller whose product has jumped in market value cannot cut output to free up inventory for better-paying customers. Quantity has to track genuine business conditions, not opportunistic maneuvering around price swings.
Shutting Down Operations
The hardest good faith questions come up when a party wants to close down entirely. The UCC’s official commentary draws the line this way: a requirements buyer who shuts down because its own customer orders have dried up may be acting in good faith, but a buyer who shuts down just to cut losses on an unfavorable contract probably is not.
The same reasoning applies to output sellers. A manufacturer that closes an obsolete or unprofitable plant for reasons unrelated to the contract stands on much stronger ground than one that stops production solely because the contract price has fallen below market. Courts look at the full picture: the party’s financial condition, industry trends, and whether the shutdown coincides suspiciously with a better alternative.
The Unreasonably Disproportionate Rule
Good faith is not the only cap. UCC 2-306(1) adds a separate limit: no party may tender or demand a quantity unreasonably disproportionate to a stated estimate, or, if no estimate is written in, to any normal or otherwise comparable prior output or requirements. The rule works as both a ceiling and a floor.
Why Stated Estimates Matter
A written estimate gives the contract a defined center point. The official commentary describes the estimate as the anchor around which variation is expected to occur, and any stated minimum or maximum makes the outer limits clearer still. A contract estimating 1,000 units per month with no cap gives a court a concrete reference if one side later demands 5,000 or drops to 50.
Without an estimate, courts look at what actually happened in comparable prior periods, which is messier, and harder still if the parties have no transaction history together. From a drafting standpoint, writing in an estimate protects everyone. Sellers can plan capacity around it, buyers can budget around it, and a court has a number to work with instead of a factual fight over what counts as normal.
How Courts Measure Proportionality
The statute does not fix a percentage. Courts weigh the size of the variance, the reason for it, industry norms, and whether the swing was foreseeable. A buyer in a booming market whose requirements genuinely doubled may be within bounds. A buyer who triples orders after the contract price falls well below market probably is not. In practice, the party seeking the unusual quantity has to show that the change reflects real business conditions.
Exclusive Dealing and Best Efforts
UCC 2-306(2) governs exclusive dealing — arrangements where one party is the sole supplier or sole distributor of a particular product. Both sides take on an implied best efforts obligation. The seller must work to supply the goods; the buyer must work to promote and sell them.
The principle traces back to Wood v. Lucy, Lady Duff-Gordon, which held that accepting an exclusive agency carries an implied duty to actually pursue the opportunity. Without that duty, a party could hold exclusive rights and do nothing, defeating the whole point of the deal.
Best efforts is a more demanding standard than good faith. Good faith asks for honesty and fair dealing. Best efforts asks for active steps to make the contract succeed. A distributor who holds exclusive rights but does not market the product, expand into new territory, or carry inventory may violate the obligation even without any dishonesty. Courts compare what the party did against what it reasonably could have done; the question is whether significant commercial opportunities were left on the table without a sound business reason.
A party who falls short can lose the exclusive arrangement or face a claim for lost profits based on what reasonable efforts would have generated. Because exclusivity leaves the other side without an alternative channel, the stakes of inaction run high.
Putting It in Writing
The UCC’s statute of frauds requires a writing for the sale of goods and provides that the contract is not enforceable beyond the quantity shown in the writing.3Legal Information Institute. UCC 2-201 – Formal Requirements; Statute of Frauds That raises an obvious problem for output and requirements contracts, which have no fixed number at signing.
The workaround built into practice is that quantity can be described by reference to the seller’s output or the buyer’s requirements rather than as a specific figure. What matters is that some quantity term appears — “all of Seller’s output” or “Buyer’s requirements” is enough. A writing with no quantity reference at all risks being unenforceable. Adding a stated estimate alongside the output or requirements language strengthens the contract and also sets up the proportionality analysis later.
Ending Open-Ended Agreements
Many of these contracts run for a set term, but some are open-ended. When a contract calls for ongoing deliveries without specifying a duration, the UCC treats it as valid for a reasonable time, and either party may terminate with reasonable notice to the other side.4Legal Information Institute. UCC 2-309 – Absence of Specific Time Provisions; Notice of Termination
What counts as reasonable notice depends on the industry, the nature of the goods, and how much time the other party needs to arrange an alternative. A contract for perishable goods readily available elsewhere may need less notice than one for custom components with long lead times. A clause that tries to strip the notice requirement entirely can be struck down as unconscionable if enforcing it would leave the other party with no practical way to adjust.