UBE Consideration
Last updated: May 2, 2026
Consideration questions are one of the highest-leverage areas to study for the UBE. This guide breaks down the rule, the elements you need to recognize, the named traps that catch most students, and a memory aid that scales to test day. Read it once, then practice the same sub-topic adaptively in the app.
The rule
Under the Restatement (Second) of Contracts § 71, consideration requires a bargained-for exchange of legal value: each party must incur a legal detriment (do, refrain from doing, or promise to do or refrain from doing something they were not legally obligated to do) that is sought by the promisor in exchange for the promise. Courts do not weigh adequacy — even a peppercorn satisfies the value prong — but they do police whether a true bargain occurred. Where consideration fails, look for a substitute basis for enforcement: promissory estoppel (Restatement § 90), the material-benefit rule for moral obligation (Restatement § 86), or a UCC-recognized firm offer or modification (UCC §§ 2-205, 2-209) for goods.
Elements breakdown
Consideration (general rule)
A promise is enforceable only if supported by a bargained-for exchange of legal value between the parties.
- Legal detriment to promisee or benefit to promisor
- Bargained for and given in exchange
- Mutuality of consideration on both sides
Legal Detriment
The promisee must do, forbear, or promise to do or forbear something the promisee was not already legally obligated to do.
- An act, forbearance, or return promise
- Not already legally required of the promisee
- Adequacy of value is not weighed by courts
Common examples:
- Forbearance from suing on a colorable claim
- Refraining from drinking, smoking until age 21 (Hamer-style forbearance)
- Promising to pay money or deliver goods
Bargained-For Exchange
The promise must induce the detriment and the detriment must induce the promise; mere motive, gift, or condition to a gratuitous promise is not consideration.
- Promise induces the detriment
- Detriment induces the promise
- Not a gift conditioned on trivial act
Pre-Existing Duty Rule
A promise to perform an act one is already legally bound to perform is not consideration for a new promise.
- Existing legal duty owed to the promisor
- No new or different performance promised
- No unforeseen difficulties supporting modification (common law)
Common examples:
- Police officer claiming reward for arrest within official duty
- Contractor demanding extra pay to finish original work without new burden
Past Consideration
An act already performed before the promise is made is not consideration because it was not bargained for.
- Act completed before promise made
- Promise not given in exchange for the act
- Not within material-benefit (§ 86) exception
Illusory Promise
A promise so indefinite or reservation-laden that the promisor has not actually committed to anything is not consideration.
- Apparent promise lacks real commitment
- Promisor retains unfettered discretion
- Cured by good-faith, requirements/output, or implied-effort obligation
Common examples:
- "I may buy if I feel like it" — illusory
- Requirements contracts — saved by UCC § 2-306 good-faith duty
- Exclusive-dealing contracts — saved by implied best-efforts
Promissory Estoppel (Substitute)
A promise reasonably expected to induce action or forbearance, which does induce such action, is enforceable to prevent injustice even without consideration.
- Promise made by promisor
- Promisor reasonably expects reliance
- Promisee actually and reasonably relies
- Injustice avoided only by enforcement
Material-Benefit Rule (Substitute)
A subsequent promise made in recognition of a material benefit previously received may be enforceable to prevent injustice (Restatement § 86).
- Material benefit previously received by promisor
- Subsequent promise to compensate
- Promise not disproportionate to benefit
- Not a mere gift
UCC Modification Rule
Under UCC § 2-209(1), a modification of a contract for the sale of goods needs no new consideration if made in good faith.
- Contract for sale of goods
- Modification sought in good faith
- Writing required if statute of frauds/no-modification clause applies
Common patterns and traps
The Common-Law-vs-UCC Modification Trigger
Whenever a contract is modified mid-stream, the very first move is to classify the contract as goods (UCC Article 2) or services/real estate (common law). Common law requires fresh consideration for modifications — the pre-existing duty rule bars enforcement otherwise, with a narrow unforeseen-difficulties exception. UCC § 2-209(1) eliminates the consideration requirement for goods modifications entirely, demanding only good faith. Bar examiners constantly hide this distinction inside facts that look like one type of contract but are actually the other (a contract for custom-fabricated goods with installation services, a software license, a construction contract).
A choice that says "unenforceable for lack of consideration" when the contract was for goods, or a choice that says "enforceable in good faith" when the contract was a services contract requiring fresh consideration.
The Gift-Conditioned-On-Trivial-Act Trap
A choice presents a 'condition' to a gratuitous promise as consideration. The test is whether the promisor sought the act as the price of the promise (consideration) or merely required it as a condition of receiving a gift (no consideration). If the act benefits only the promisee and the promisor's motivation is gratuitous, no consideration exists.
"Yes, because the promisee performed the requested act" — but the requested act was a trivial step the promisor demanded only to enable receipt of an intended gift.
The Past-Consideration / Moral-Obligation Lure
Facts describe a benefit already conferred, then a later promise to pay. The trap choice says the later promise is enforceable because of the prior service or moral obligation. Under the majority rule, past consideration is no consideration. Restatement § 86's material-benefit rule provides a narrow exception, but most past-consideration fact patterns don't satisfy it (the benefit must be material, the promise proportionate, and not a gift).
"Enforceable, because Reyes promised in recognition of past services" — when no new exchange occurred and the § 86 elements are not met.
The Illusory-Promise Distractor
One side appears to promise something but retains so much discretion that the promise commits to nothing. Bar fact patterns dress this up as 'I'll buy as much as I want,' 'I may decide to perform,' or unilateral cancellation rights without notice. The cure on the bar is the implied good-faith obligation in requirements/output contracts (UCC § 2-306) or implied best-efforts in exclusive dealings.
"No contract, because the promise was illusory" — correct when discretion is unfettered; wrong when UCC § 2-306 or implied effort doctrine supplies the missing commitment.
The Pre-Existing Duty Modification Trap
A contractor (or other party) demands more money mid-performance to complete already-promised work. Under common law, no new consideration supports the modification, and it's unenforceable absent unforeseen difficulties. Bar examiners pair this with construction or services facts where the trap choice enforces the modification or denies a refund of payment already made.
"The owner must pay the additional $20,000 because she agreed to it" — wrong under common law's pre-existing duty rule unless unforeseen difficulties or a rescission-and-new-contract are present.
How it works
Start every consideration question by asking: what did each side give up that they were not already obligated to give up, and was it bargained for? Suppose Reyes promises her nephew "$5,000 if you graduate college," and the nephew graduates. Reyes's promise is enforceable: graduation is a legal detriment (he was not obligated to graduate) bargained for in exchange for the money. Contrast: "I'll give you $5,000 next month — you've been such a good nephew." That's a gratuitous promise; the prior good behavior is past consideration. The bar loves to test the seam between bargain and gift, the pre-existing duty rule (especially construction modifications under common law versus UCC § 2-209), and illusory promises masquerading as commitments. When consideration fails, immediately scan for promissory estoppel: did the promisee actually and detrimentally rely?
Worked examples
Will Patel prevail on the amendment?
- A Yes, because Liu signed a written amendment and writings are presumptively supported by consideration.
- B Yes, because under UCC § 2-209(1), a good-faith modification needs no new consideration.
- C No, because Patel was already legally obligated to complete the home for $480,000 and supplied no new consideration for the modification. ✓ Correct
- D No, because Liu signed under economic duress arising from the impending sale of her current home.
Why C is correct: This is a services/real estate contract governed by common law, not UCC Article 2. Under the pre-existing duty rule, a promise to perform what one is already legally bound to perform is not consideration for a new promise. Patel offered no additional or different performance and identified no unforeseen difficulties (ordinary soil conditions don't qualify). The modification fails for lack of consideration.
Why each wrong choice fails:
- A: There is no general rule that signed writings are presumed supported by consideration; consideration must be independently established. Even formal writings fail under the pre-existing duty rule. (The Pre-Existing Duty Modification Trap)
- B: UCC § 2-209(1) applies only to contracts for the sale of goods. A residential construction contract is a services and real estate contract governed by common law, which still requires fresh consideration for modifications. (The Common-Law-vs-UCC Modification Trigger)
- D: Economic duress requires a wrongful threat that leaves no reasonable alternative; the facts more cleanly fail for lack of consideration. Even if duress were arguable, the cleanest doctrinal answer is the pre-existing duty rule, and Patel's claim fails on that simpler ground.
Is Reyes's promise enforceable?
- A Yes, because Okafor's fifteen years of service constitute consideration for the promise.
- B Yes, because Reyes was morally obligated to compensate Okafor for his loyalty.
- C Yes, because Reyes's eight months of payments ratified the promise and supplied consideration.
- D No, because the promise lacks a bargained-for exchange and Okafor did not rely on it. ✓ Correct
Why D is correct: Okafor's prior service is past consideration — it was not bargained for in exchange for the promise. The material-benefit rule (Restatement § 86) is a narrow exception for benefits previously conferred where the promise corrects unjust enrichment, and ordinary completed employment for which the employee was already paid does not qualify. Without bargained-for consideration and without reliance, no basis for enforcement exists. The promise is a gratuitous, unenforceable gift promise.
Why each wrong choice fails:
- A: Past consideration is not consideration. Okafor's service was performed years before the promise and was already compensated through his salary; it was not given in exchange for the lifetime payments. (The Past-Consideration / Moral-Obligation Lure)
- B: Moral obligation alone does not create enforceable consideration under the majority rule. Restatement § 86's material-benefit rule is narrow and does not cover compensation for ordinary paid employment. (The Past-Consideration / Moral-Obligation Lure)
- C: Partial performance of a gratuitous promise does not retroactively supply consideration; the promisor remains free to discontinue. There is no doctrine of 'ratification by performance' that converts a gift promise into a contract.
Will Liu prevail?
- A Yes, because requirements contracts are illusory unless quantities are fixed in advance, so Liu may demand any reasonable amount.
- B Yes, because Patel agreed to supply all of Liu's requirements and is bound to ship whatever Liu orders during the contract term.
- C No, because under UCC § 2-306, requirements must be tendered in good faith and may not be unreasonably disproportionate to any stated estimate or prior comparable requirements. ✓ Correct
- D No, because requirements contracts are illusory and lack the mutuality of obligation needed to form a contract.
Why C is correct: This is a contract for the sale of goods, governed by UCC Article 2. UCC § 2-306(1) saves requirements contracts from the illusory-promise objection by imposing a good-faith obligation: actual requirements demanded must not be unreasonably disproportionate to any stated estimate or, absent one, to prior comparable requirements. Liu's effort to inflate orders to capture a market arbitrage — without any change in actual operations — is the paradigm bad-faith demand the section forbids.
Why each wrong choice fails:
- A: Requirements contracts are not illusory under the UCC; § 2-306 supplies a good-faith obligation that cures the discretion problem. The 'reasonable amount' framing also misstates the rule, which polices proportionality and good faith, not raw reasonableness. (The Illusory-Promise Distractor)
- B: Patel's obligation is to supply Liu's good-faith requirements, not unlimited or arbitrage-driven orders. Treating the contract as open-ended ignores § 2-306's express good-faith and disproportionality limits.
- D: This applies a pre-Code, common-law-style illusory-promise objection that the UCC has displaced for goods. Under UCC § 2-306, requirements and output contracts have mutual consideration through the implied good-faith duty. (The Illusory-Promise Distractor)
Memory aid
BLAST the consideration analysis: Bargained-for, Legal detriment, Adequacy irrelevant, Settlement of claim counts (if colorable), Time matters (past won't do). For modifications, ask "goods or services?" — UCC needs only good faith; common law needs new consideration or unforeseen difficulty.
Key distinction
Bargained-for exchange versus gift conditioned on trivial act. The classic fork: did the promisor seek the detriment as the price of the promise (consideration), or did the promisor merely impose a condition on a gift the promisor wanted to give anyway (no consideration)? "Walk to the corner store and I'll give you a coat" — the walk is a condition of receiving the gift, not the price the promisor sought.
Summary
Consideration is a bargained-for exchange of legal detriment — without it, hunt for promissory estoppel, the material-benefit rule, or a UCC modification before declaring the promise unenforceable.
Practice consideration adaptively
Reading the rule is the start. Working UBE-format questions on this sub-topic with adaptive selection, watching your mastery score climb in real time, and seeing the items you missed return on a spaced-repetition schedule — that's where score lift actually happens. Free for seven days. No credit card required.
Start your free 7-day trialFrequently asked questions
What is consideration on the UBE?
Under the Restatement (Second) of Contracts § 71, consideration requires a bargained-for exchange of legal value: each party must incur a legal detriment (do, refrain from doing, or promise to do or refrain from doing something they were not legally obligated to do) that is sought by the promisor in exchange for the promise. Courts do not weigh adequacy — even a peppercorn satisfies the value prong — but they do police whether a true bargain occurred. Where consideration fails, look for a substitute basis for enforcement: promissory estoppel (Restatement § 90), the material-benefit rule for moral obligation (Restatement § 86), or a UCC-recognized firm offer or modification (UCC §§ 2-205, 2-209) for goods.
How do I practice consideration questions?
The fastest way to improve on consideration is targeted, adaptive practice — working questions that focus on your specific weak spots within this sub-topic, getting immediate feedback, and revisiting items you missed on a spaced-repetition schedule. Neureto's adaptive engine does this automatically across the UBE; start a free 7-day trial to see your sub-topic mastery climb in real time.
What's the most important distinction to remember for consideration?
Bargained-for exchange versus gift conditioned on trivial act. The classic fork: did the promisor seek the detriment as the price of the promise (consideration), or did the promisor merely impose a condition on a gift the promisor wanted to give anyway (no consideration)? "Walk to the corner store and I'll give you a coat" — the walk is a condition of receiving the gift, not the price the promisor sought.
Is there a memory aid for consideration questions?
BLAST the consideration analysis: Bargained-for, Legal detriment, Adequacy irrelevant, Settlement of claim counts (if colorable), Time matters (past won't do). For modifications, ask "goods or services?" — UCC needs only good faith; common law needs new consideration or unforeseen difficulty.
What's a common trap on consideration questions?
Treating past consideration or moral obligation as consideration
What's a common trap on consideration questions?
Missing the pre-existing duty rule in mid-contract modifications
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