⚡ 10-Second Rule
A big breach lets you stop performing and walk away; a small breach only earns you money.
🧒 ELI-10 Scene
You pay Zoe fifty dollars to build a backyard treehouse. She builds it with no floor. That's not a treehouse — you can refuse to pay and hire someone else. Different day, different job: Zoe builds the whole treehouse perfectly but forgets the little flag on top. You still pay her. You just subtract a dollar for the flag. Now imagine buying a box of twelve cupcakes from a bakery counter. One cupcake is the wrong flavor. For store-bought goods, you may send the whole box back — but the baker usually gets a fast chance to swap the bad one.
⚖️ Actual Rule
At common law, an uncured material breach by one party suspends the other party's duty to perform; if the breach is not cured within a reasonable time, it becomes a total breach, discharging the injured party and permitting termination plus damages. A minor (immaterial) breach gives damages only — the injured party must still perform. Materiality turns on factors the Restatement (Second) of Contracts § 241 identifies (paraphrased): how much of the expected benefit the injured party loses; how adequately damages can compensate that loss; how much the breaching party would forfeit; how likely the breaching party is to cure; and whether the breaching party acted in good faith. Section 242 (paraphrased) adds that the passage of time and the importance of prompt performance bear on when suspension ripens into discharge. If a contract is divisible — performances exchanged in matched pairs — a party who completes some units may recover the price of those units despite breaching others (Restatement § 240, paraphrased). The UCC displaces materiality for a single-delivery sale of goods with the perfect tender rule: under UCC § 2-601, "if the goods or the tender of delivery fail in any respect to conform to the contract, the buyer may (a) reject the whole; or (b) accept the whole; or (c) accept any commercial unit or units and reject the rest." The seller's right to cure (UCC § 2-508) tempers this: if time for performance has not expired, the seller may seasonably notify the buyer and cure within the contract time; if the seller reasonably believed the tender would be acceptable, the seller gets a further reasonable time to substitute a conforming tender. For installment contracts (UCC § 2-612), the buyer may reject an installment only if a nonconformity substantially impairs that installment's value and cannot be cured, and the whole contract is breached only if the nonconformity substantially impairs the value of the whole contract.
ELI-10 translation: big breaks end the deal; small breaks cost money; single shipments of goods must be perfect, but sellers often get a redo.
🔍 Ask These Questions
- Is this a sale of goods? (Goods use the strict "perfect box" rules; services and land use the big-versus-small test.)
- If goods, is it one delivery or installments? (One delivery must be perfect; repeat shipments only fail if seriously spoiled.)
- If one delivery, can the seller still cure? (Is there time left, or a fair reason to expect a redo?)
- If common law, is the breach material — weigh the § 241 factors. (How much of the prize did the innocent side lose?)
- If material, has the time to cure run out? (First you may pause; only later may you quit for good.)
- Is the contract divisible? (If work comes in matched chunks, finished chunks still get paid.)
⚠️ Bar Trap
Exam language: Examiners run substantial performance and material breach analysis into a single-delivery contract for the sale of goods — where the perfect tender rule of UCC § 2-601 governs and any nonconformity permits rejection. The mirror trap applies perfect tender to an installment contract, where § 2-612 requires substantial impairment. And within perfect tender itself, they hide the seller's § 2-508 cure right, baiting you into blessing a buyer's final cancellation while the seller still had time to fix the shipment.
ELI-10: First ask: goods or not, one box or many? One box of goods must be perfect — but the seller usually gets a redo. Many boxes, or a services deal, must only be badly hurt before you can quit.
🧪 Question
A café owner ordered 40 matching cobalt-glazed ceramic mugs from a potter for $800, delivery due by March 1. On February 20, the potter delivered 40 mugs: 38 cobalt, 2 mistakenly glazed forest green. The café owner immediately notified the potter that she was rejecting the entire shipment. The potter responded the same day that he would fire two replacement cobalt mugs and deliver them by February 27, but the café owner refused the offer, returned all 40 mugs, and bought mugs elsewhere. The potter sued the café owner for breach.
Who should prevail?
(A) The café owner, because the tender failed to conform to the contract in some respect. (B) The café owner, because a nonconformity in any commercial unit entitles the buyer to cancel the contract permanently. (C) The potter, because two nonconforming mugs did not substantially impair the value of the whole contract. (D) The potter, because he seasonably notified the café owner of his intent to cure and could deliver conforming mugs before March 1.
Answer: (D). The initial rejection was proper under the perfect tender rule, but because the contract time had not expired, UCC § 2-508(1) gave the seller the right to seasonably notify and cure by the March 1 deadline. The buyer's refusal to permit cure — and her final cancellation — put her in breach.
💡 Why the Wrong Answers Are Wrong
- (A) states § 2-601 correctly but stops too soon: rejection is valid, yet cancellation before the cure window closes is not.
- (B) invents a rule; nonconformity permits rejection, not automatic permanent cancellation while cure remains available.
- (C) applies the § 2-612 substantial-impairment standard, which governs installment contracts, not a single-delivery sale.
- ELI-10: The misconception is thinking "I can send it back" means "the deal is dead." Sending it back is step one; the seller's redo can still save the deal.
