The Reliance Trigger: When a Promise Becomes Enforceable
Promissory estoppel enforces a promise when reliance, rather than a bargained-for exchange, makes nonenforcement unjust. Apply Restatement (Second) of Contracts §90 in this order:
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Promise: The promisor made a manifestation of commitment, not merely a prediction, opinion, puffery, or preliminary negotiation. A sufficiently definite statement of intention may constitute a promise, depending on how it would reasonably be understood.
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Expected inducement: The promisor should reasonably have expected the promise to induce action or forbearance by the promisee or a third person.
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Actual reliance: The promise did induce action or forbearance. The claimant must connect the change in position to the promise; reliance that occurred before the promise does not qualify.
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Reasonableness and detriment: The reliance was reasonable under the circumstances and constituted action or forbearance that caused a detriment or otherwise changed the claimant’s position. Spending money, giving up employment, moving, beginning performance, or forbearing from a legal right can qualify. The promisor need not receive a benefit.
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Injustice: Injustice can be avoided only by enforcing the promise. A breach alone is not enough; the court considers the seriousness of the reliance, the promisor’s conduct, the clarity of the promise, and whether another remedy adequately addresses the harm.
The promise need not have been supported by consideration, and the claimant need not prove that the promise would have been an enforceable offer or contract. But promissory estoppel is not a substitute for identifying the promisor’s actual words. A vague hope that “things will work out” does not become a promise merely because someone relies on it.
Timing matters. The promisor’s expectation is judged when the promise was made; actual causation and reasonableness are judged from what happened afterward. Reliance must be sufficiently connected to the promise. If an employee quits before the employer makes the promised offer, the quitting cannot be reliance on that offer. If the employee quits after the promise but for an unrelated reason, actual inducement is missing.
The remedy is deliberately flexible. Under §90, the promise is binding only to the extent justice requires. The court may award reliance damages, enforce the promise partially, or provide another limited remedy. Full expectation damages are not automatic. A claimant who spends $4,000 in reliance does not necessarily receive the promised $50,000, particularly where awarding the full amount would overcompensate the claimant.
Promissory estoppel is also distinct from reliance that makes an offer irrevocable; the sibling chapter on acceptance and irrevocable offers owns that revocation question. Here the question is whether reliance makes the underlying promise enforceable. Under UCC §1-103(b), common-law principles supplement Article 2 unless displaced, so §90 can matter in a goods setting, but Article 2’s Statute of Frauds and its specific exceptions remain separate issues. This is closed-book-state §90’s five-part application and its limited-remedy rule without prompting.
The Benefit-Based Obligation: Restitution Without a Bargain
Restitution enforces a benefit-based obligation. The central question is not “Was there a promise that induced reliance?” but “Would the recipient be unjustly enriched by retaining a benefit received at the claimant’s expense?”
For implied-in-law restitution, analyze these requirements:
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Benefit: The claimant conferred a measurable benefit on the recipient, such as money, services, goods, or necessary protection of property.
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At the claimant’s expense: The benefit came from the claimant or caused the claimant to incur the relevant cost.
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Knowledge or acceptance: The recipient knew of and accepted the benefit, or the circumstances make the benefit chargeable despite the recipient’s inability to consent.
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Unjust retention: Retaining the benefit without payment would be inequitable in the circumstances.
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No gift or officious intervention: The claimant did not intend to confer a gift and did not force an unwanted benefit on the recipient for the claimant’s own purposes.
A request for the service strongly supports restitution because it shows that the recipient wanted the benefit. A recipient who knowingly accepts a service and has an opportunity to reject it may also be liable even if the price was never agreed. By contrast, the officious intermeddler rule denies recovery when a person unilaterally provides an unwanted benefit, especially to create a payment claim or pursue the person’s own objectives.
The principal exception to the no-request rule is an emergency. A person who supplies necessary services to protect another’s person or property when the recipient cannot consent may recover the reasonable value of those services, provided the services were necessary and the claimant was not acting as a volunteer. A mistaken payment is another important setting: the recipient generally must return money paid by mistake, subject to defenses such as a good-faith change of position.
Restitution measures the recipient’s enrichment, not the claimant’s expected profit and not the value of a promise. If a contractor’s unsolicited work increases property value by $2,000, the contractor ordinarily cannot recover a $10,000 hoped-for fee. If the recipient was not enriched, or if the benefit was intended as a gift, restitution fails. If the recipient changed position in good faith before learning of a mistaken transfer, the amount recoverable may be reduced to prevent unfairness.
A related doctrine is Restatement (Second) of Contracts §86, promise for benefit received. It concerns a later promise made in recognition of a benefit previously received by the promisor from the promisee. The promise may be binding to the extent necessary to prevent injustice even though the earlier benefit was not bargained for. Section 86 does not apply when the benefit was conferred as a gift or when the promisor was not unjustly enriched. If the promised performance is disproportionate to the benefit received, the promise is not binding to the extent of that disproportion.
Keep the two restitution routes separate:
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Pure restitution: No later promise is necessary. The claimant seeks the value of an unjustly retained benefit.
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Section 86: A later promise exists, but its enforcement is limited by the benefit and by what preventing injustice requires.
That distinction prevents a common error: treating every promise made after a benefit as enforceable for its full stated amount. A later promise may be evidence of the enrichment, but §86 does not automatically convert a past benefit into a full contract claim. The consideration chapter’s treatment of past consideration and moral obligation is the boundary; §86 asks specifically about benefit received and unjust enrichment.
Restitution may also restore benefits transferred under an invalid or unenforceable agreement. That remedy does not enforce the failed bargain or award expected profits; it returns or values what the recipient actually received. In a goods transaction, first determine whether Article 2 supplies an enforceable contract or a specific statutory remedy. If it does, use that governing rule rather than quasi-contract for the same performance. If no contract governs, common-law restitution may supplement Article 2 under §1-103(b), unless displaced.
| Question | Promissory estoppel | Implied-in-law restitution | Restitution-based promise |
|---|---|---|---|
| Source of obligation | Promise plus reliance | Benefit plus unjust retention | Later promise recognizing prior benefit |
| Required claimant showing | Expected and actual reasonable reliance | Benefit conferred at claimant’s expense | Benefit received by promisor from promisee |
| Main near miss | No actual promise or no induced reliance | Gift or officious intermeddling | Benefit was a gift or promise is disproportionate |
| Usual measure | Reliance or limited enforcement | Value of recipient’s enrichment | Amount necessary to prevent injustice |
| What is not automatic | Full expectation damages | Promised price or claimant’s hoped-for profit | Full amount of later promise |
The Boundary in Action: One Promise With No Benefit
An aunt told her niece, “I will give you $20,000 for your first year of nursing school. This is a gift, not payment for anything you do.”
The aunt knew the niece relied on the promise. The niece rejected a paid summer internship, enrolled in the program, and paid a nonrefundable $8,000 tuition deposit.
Before classes began, the aunt withdrew the promise. The niece brings an action to recover.
Practice
Which is the niece’s strongest basis for recovery?
The recurring errors are these:
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Treating the niece’s enrollment as consideration despite the aunt’s express statement that the promise was not an exchange.
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Calling the tuition payment restitution when the aunt received no benefit from it.
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Awarding the full $20,000 automatically instead of applying §90’s limited-remedy principle.
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Seeking payment for unsolicited lawn mowing when the homeowner neither requested nor knowingly accepted the service.
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Using restitution to enforce the promised price of goods when an Article 2 contract or specific UCC remedy controls.
Three Pressure Tests: Promise, Past Benefit, and Unrequested Work
Practice
A company president told Dana, “I will pay your $15,000 graduate-school tuition. I am offering this as support, not in exchange for services.” Relying on the statement, Dana declined a job and paid a nonrefundable tuition deposit. The president later withdrew the promise. What is Dana’s strongest claim?
After a storm, Mara repaired her neighbor’s broken gate without being asked. The neighbor saw the completed repair, kept the improved gate, and then promised to pay Mara $700. The reasonable value of the benefit was $400, and the neighbor later refused to pay. Which result is best?
A landscaper mistakenly mowed a homeowner’s lawn while the homeowner was away. The landscaper was trying to advertise the business, the homeowner never requested the work, and the homeowner did not know about it until it was finished. May the landscaper recover the usual fee in restitution?
High-Yield Points - ⚡ Biggest Takeaways
Use §90 only when a promise actually induced reasonable reliance and injustice requires enforcement. Restitution follows an unjust benefit; it does not award the promise’s value or compensate an officious volunteer. A later promise for a past benefit is §86: enforce only what preventing injustice requires.
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