UCC 2-306: Good Faith, Quantity Limits, and Best Efforts

UCC 2-306 is the Uniform Commercial Code provision that makes output, requirements, and exclusive dealing contracts enforceable even though the quantity is not fixed when the parties sign. Instead of a specific number, the quantity floats with what the seller actually produces or what the buyer actually needs, bounded by a good faith obligation and a ceiling on quantities that are unreasonably disproportionate to a stated estimate or prior dealings. A separate subsection covers exclusive dealing arrangements and implies a best efforts duty on both sides.¹

What the Statute Covers

Section 2-306(1) validates two open-quantity structures. In an output contract, the seller agrees to sell everything it produces of a particular good and the buyer agrees to buy that output. In a requirements contract, the buyer agrees to purchase everything it needs of a particular good from one seller and the seller agrees to fill those orders. Both replace a fixed number with a quantity tied to real business activity.¹

A standard challenge to these contracts is that they lack mutuality, since one side appears to control the quantity entirely. The UCC rejects that reading. The party controlling quantity is bound to act in good faith and according to reasonable commercial standards of fair dealing, and that binding obligation is the consideration that makes the deal enforceable.¹

One boundary worth drawing: a requirements contract does not automatically make the arrangement exclusive. The buyer must purchase its needs from the seller, but the seller is not necessarily barred from selling to others. Exclusive dealing lives in subsection (2) and carries its own obligations.

Good Faith and the Disproportionality Ceiling

Every demand or tender under a 2-306 contract has to satisfy the UCC’s definition of good faith: honesty in fact and the observance of reasonable commercial standards of fair dealing.² A buyer who quadruples an order to exploit a price drop, or a seller who slashes output to force renegotiation, is not acting in good faith, and the counterparty does not have to go along.

On top of good faith, the statute sets a hard ceiling. No quantity may be unreasonably disproportionate to either a stated estimate in the contract or, if none exists, to normal or otherwise comparable prior output or requirements.¹ If a contract estimates 10,000 units a year, a jump to 12,000 because the buyer expanded into a new region is probably fine. A jump to 50,000 because commodity prices collapsed almost certainly is not.

Without an estimate and without a prior course of dealing, courts have little to work with. That gap makes both proving and defending a disproportionality claim harder, which is a strong reason to include a stated estimate even when the parties cannot predict volume precisely.

Can a Party Drop Quantity to Zero?

This is the question most 2-306 litigation turns on. The statute measures quantity by “actual output or requirements as may occur in good faith,” which leaves room for legitimate business changes but also room to argue.¹

Courts generally separate two situations. If a buyer’s requirements genuinely fall to zero because it exits a product line, closes a plant, or loses a key customer, the reduction can be permissible, provided the decision rested on legitimate business reasons rather than a desire to escape the contract. A manufacturer shutting a factory that is losing money sits in a very different position from one quietly moving production to a cheaper in-house source while claiming it has no requirements.

The same logic applies to a seller under an output contract. Ceasing production because the business is no longer viable is defensible; halting output to force a price renegotiation is not. The dividing line is good faith, and the burden of showing it generally falls on whoever cut the quantity. A shutdown is not automatically a breach, but it is almost always challenged.

Exclusive Dealing and Best Efforts

Section 2-306(2) handles a different arrangement: contracts giving one party the sole right to sell or distribute the other party’s goods. When a contract creates that exclusivity, the law implies a best efforts duty on both sides, even if the written contract never uses the phrase.¹

For the seller, best efforts means using reasonable diligence to supply the goods needed to meet market demand, rather than diverting resources to more profitable projects. For the buyer, it means actively promoting and marketing the goods. An exclusive distributor that warehouses inventory and makes no genuine sales effort is breaching the implied obligation whether the contract addresses marketing or not.

The stakes are high because the counterparty has no alternative. If the seller does nothing, the buyer has no product and no backup supplier. If the buyer does nothing, the seller has no other channel to market. A failure to use best efforts can support both termination and substantial damages.

Drafting Around the Defaults

The statute functions as a safety net, but a careful contract does most of the work before any dispute surfaces. Three tools matter most.

A stated estimate gives courts a concrete benchmark for the disproportionality test. Without one, the only reference is prior dealings, which may not exist or may be ambiguous. The estimate does not cap or guarantee volume; it narrows the range of permissible fluctuation.¹
Minimum and maximum caps remove most of the ambiguity the good faith standard leaves open. A floor protects the seller from a buyer slowly zeroing out orders; a ceiling protects the buyer from a seller flooding the channel. The official commentary treats any agreed minimum or maximum as a clear limit on the intended elasticity.
Adjustment mechanisms tie quantity changes to verifiable metrics, such as a percentage increase keyed to the buyer’s revenue growth or an annual cap that resets based on the prior year’s volume. A formula is easier to apply than a court’s post hoc reasonableness judgment.

Contracts resting entirely on the statute’s defaults are enforceable, but they hand considerable discretion to a judge or arbitrator. More specific quantity terms make full litigation less likely.

Remedies When Someone Breaches

When a party violates the good faith or proportionality rules of 2-306, the injured side turns to the standard UCC damages provisions. The applicable formula depends on who breached.

If the seller fails to deliver, say by cutting output in bad faith, the buyer recovers the difference between market price at the time it learned of the breach and the contract price, plus incidental and consequential damages, minus expenses saved.³ In practice, that captures the extra cost of covering on the open market.

If the buyer breaches by inflating requirements beyond good faith or dropping orders without justification, the seller recovers the difference between market price at the time of tender and the unpaid contract price, plus incidental damages, minus expenses saved.⁴ When that formula does not make the seller whole, which is common for sellers who could have sold to other buyers anyway, the seller may instead recover lost profits, including reasonable overhead.

In a 2-306 case the disputed quantity itself is often the main fight. A stated estimate anchors the damages calculation. Without one, the court falls back on normal or otherwise comparable prior output or requirements to decide what the parties should have expected, and that baseline sets the scope of recovery.

1
Legal Information Institute. Uniform Commercial Code 2-306
2
Legal Information Institute. Uniform Commercial Code 1-201 – General Definitions
3
Legal Information Institute. Uniform Commercial Code 2-713 – Buyer’s Damages for Non-Delivery or Repudiation
4
Legal Information Institute. Uniform Commercial Code 2-708 – Seller’s Damages for Non-Acceptance or Repudiation