13.3 Consideration, Modification, Promissory Estoppel & Restitution

13.3 Consideration, Modification, Promissory Estoppel & Restitution

Consideration and its substitutes determine whether a promise is enforceable at all. When consideration is missing, look for a substitute—promissory estoppel, a statutory exception such as § 2-209, or a promise to pay a debt barred by the statute of limitations—and, if no promise is enforceable, consider whether restitution is available for a benefit already conferred.

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Even where mutual assent exists, an agreement is not an enforceable contract at law unless it is supported by consideration or a recognized substitute such as promissory estoppel. On the MBE, consideration issues frequently arise in the context of gift promises, settlement of debts, and mid-stream contract modifications.

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1. The Nature of Consideration: Bargained-For Legal Value

Under Restatement (Second) of Contracts § 71, consideration requires a bargained-for exchange of legal value:

1. Bargained-For Exchange: The promise must induce the detriment, and the detriment must induce the promise. The promisor must seek the performance or return promise in exchange for their own promise, and the promisee must give the performance or return promise in exchange for that promise.
2. Legal Detriment / Legal Benefit Test: Legal value does not mean financial value. A party suffers a legal detriment if they:
   • Do something they were not legally obligated to do; OR
   • Refrain from doing something they had a legal right to do (forbearance).

Hamer v. Sidway (1891) and Forbearance

In the canonical decision Hamer v. Sidway, an uncle promised to pay his nephew $5,000 if the nephew refrained from drinking alcohol, using tobacco, swearing, and playing cards or billiards for money until age 21. The nephew fully complied. The uncle's estate argued there was no consideration because the nephew was physically benefited and the uncle received no tangible benefit. The New York Court of Appeals held that forbearance from lawful conduct constitutes sufficient legal detriment, regardless of whether it produces any benefit to the promisor or improves the promisee's health.

Adequacy of Consideration: The "Peppercorn" Rule

Courts will evaluate whether legal consideration exists, but they do not police the economic adequacy or fairness of the exchange ("a peppercorn can be consideration"). Parties are free to make unequal or foolish bargains.

• Sham / Nominal Consideration Exception: If the consideration is purely nominal and intended as a mere formal sham to disguise a gift (e.g., "In exchange for $1 in hand paid, I deed you my $500,000 mansion"), courts will disregard it as lacking a genuine bargained-for exchange.

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2. What Does NOT Constitute Consideration?

Contract questions on the MBE often present scenarios involving promises that appear binding at first glance but fail for lack of consideration:

┌──────────────────────────────────────┬──────────────────────────────────────┐
│      Defective Consideration         │             Legal Rationale          │
├──────────────────────────────────────┼──────────────────────────────────────┤
│ Illusory Promise                     │ Promisor retains unfettered          │
│ (e.g., "I will buy if I feel like it")│ discretion; no real commitment made. │
├──────────────────────────────────────┼──────────────────────────────────────┤
│ Gratuitous / Donative Promise        │ Lack of bargained-for exchange;      │
│ (e.g., "I will give you my car")     │ condition to gift is not detriment.  │
├──────────────────────────────────────┼──────────────────────────────────────┤
│ Past Consideration                   │ Act was performed before promise was │
│ (e.g., "Because you saved me, I pay")│ made; not induced by the promise.    │
├──────────────────────────────────────┼──────────────────────────────────────┤
│ Preexisting Legal Duty               │ Party already legally obligated to   │
│ (e.g., police officer catching thief)│ perform; no new legal detriment.     │
└──────────────────────────────────────┴──────────────────────────────────────┘

A. Illusory Promises

An illusory promise is a statement that appears to be a promise but commits the promisor to nothing, leaving performance entirely optional at the promisor's unfettered whim or discretion (e.g., "I promise to buy your laptop for $500 if I decide I want it next week"). Because the promisor incurs no legal detriment, there is no consideration, and neither party is bound.

• Requirements and Output Contracts Are NOT Illusory: Under UCC § 2-306, requirements and output contracts are valid because the parties' discretion is legally constrained by the mandatory duty of good faith and commercial fair dealing.
• Satisfaction Clauses Are NOT Illusory: A promise conditioned on the promisor's "satisfaction" is enforceable because the promisor must judge satisfaction in good faith (commercial standard of reasonable person for mechanical utility; subjective good faith for aesthetics/art).

B. Past Consideration and Moral Obligation

An act performed before a promise is made cannot serve as consideration for that promise. Because the act was already completed, it could not have been bargained for or induced by the subsequent promise.

Exceptions Where Past Consideration / Moral Obligation Is Enforceable

1. Debt Barred by Statute of Limitations or Bankruptcy: A subsequent express promise to pay all or part of a debt that has been discharged in bankruptcy or barred by the expiration of the statute of limitations is enforceable without new consideration. In most jurisdictions, the promise must be evidenced by a signed writing.
2. Material Benefit Rule / Promissory Restitution (Restatement § 86): Under Webb v. McGowin (1935), where a promisee confers a substantial material benefit directly upon the promisor in an emergency (such as saving the promisor's life or property), and the promisor subsequently makes an express promise to compensate the promisee, the promise is enforceable to the extent necessary to prevent injustice.
   • Limitation: The rule does not apply if the promisee originally conferred the benefit as a gratuitous gift or if the promisor was not directly benefited.

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3. The Preexisting Legal Duty Rule (Common Law)

Under Common Law, performing or promising to perform an act that a party is already legally obligated to do is not legal consideration (Stilk v. Myrick; Foakes v. Beer).

• Hypothetical: A builder agrees to construct a warehouse for $100,000. Midway through construction, the builder demands an extra $20,000 to finish. The owner agrees. Upon completion, the owner pays $100,000 and refuses to pay the extra $20,000. The builder cannot collect the $20,000 because the builder did nothing more than what was already required under the original contract.

Common Law Exceptions to the Preexisting Duty Rule

A contract modification without new consideration is enforceable under Common Law in the following narrow circumstances:

1. Unforeseen Supervening Difficulties (Restatement § 89): A modification of an executory contract is enforceable without consideration if:
   • The modification is fair and equitable in light of circumstances not anticipated by the parties when the contract was made; AND
   • The contract has not been fully performed on either side.
   • Note: The unforeseen event must be extraordinary (e.g., unexpected subterranean granite requiring specialized blasting), not ordinary market fluctuations or standard cost increases.
2. Change in Performance / Additional Duties: If the promisee undertakes any new, different, or additional performance—no matter how small—sufficient legal detriment exists (e.g., agreeing to complete work one day earlier, using a different delivery method, or performing additional minor services).
3. Third-Party Promise Exception: Under modern contract law (Restatement § 73), if Party A owes a contractual duty to Party B, and Third-Party C promises to pay Party A an additional sum to perform that existing duty, Party A's performance constitutes valid consideration for Party C's promise.
4. Settlement of Disputed / Unliquidated Claims (Accord and Satisfaction): If a debt is unliquidated (uncertain in amount) or subject to a bona fide honest dispute, an agreement to settle the debt for a compromised sum is supported by consideration (forbearing the legal right to contest liability).
   • Liquidated Debt Rule: If a debt is undisputed, liquidated, and currently due, a creditor's promise to accept $8,000 in full satisfaction of a $10,000 debt is unenforceable for lack of consideration (Foakes v. Beer). The creditor may collect the remaining $2,000.

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4. Contract Modification under UCC Article 2: § 2-209

UCC § 2-209(1) explicitly abolishes the Preexisting Legal Duty Rule for contracts involving the sale of goods:

"An agreement modifying a contract within this Article needs no consideration to be binding."

                      ┌────────────────────────────────────────┐
                      │       Contract Modification Issue      │
                      └───────────────────┬────────────────────┘
                                          │
                ┌─────────────────────────┴─────────────────────────┐
                ▼                                                   ▼
      ┌──────────────────┐                                ┌──────────────────┐
      │   Common Law     │                                │  UCC Article 2   │
      │(Services / Land) │                                │ (Sale of Goods)  │
      └────────┬─────────┘                                └────────┬─────────┘
               │                                                   │
               ▼                                                   ▼
      ┌──────────────────┐                                ┌──────────────────┐
      │ Consideration is │                                │NO CONSIDERATION  │
      │REQUIRED unless:  │                                │     NEEDED       │
      │1. Unforeseen     │                                │(UCC § 2-209(1)). │
      │   hardship       │                                │                  │
      │2. Altered duty   │                                │Must be made in   │
      │3. Third party    │                                │GOOD FAITH for a  │
      │4. Honest dispute │                                │commercial reason.│
      └──────────────────┘                                └──────────────────┘

A. The Good-Faith Requirement

Although no consideration is required, a modification under Article 2 is valid only if made in good faith (honesty in fact and observance of reasonable commercial standards of fair dealing under UCC § 1-304 & § 2-103):

• Legitimate Commercial Reason: The party seeking modification must have a legitimate business reason (e.g., unexpected sharp price increases by upstream component suppliers, unforeseen transportation strikes, market shifts).
• Coercion / Extortion Barred: Using economic coercion or threatening bad-faith breach to extract a price increase from a vulnerable buyer constitutes bad faith, rendering the modification unenforceable.

B. Statute of Frauds Interaction (§ 2-209(3))

If the contract as modified falls within the Statute of Frauds (sale of goods for $500 or more), the modification must satisfy the Statute of Frauds with a signed writing:

• If an original oral contract for $400 of goods is modified to $600, the modification requires a signed writing.
• If an original written contract for $10,000 of goods is modified down to $450, the modification is valid orally.

C. No Oral Modification (NOM) Clauses (§ 2-209(2))

• UCC Article 2: A signed agreement which excludes modification or rescission except by a signed writing cannot be otherwise modified (NOM clauses are strictly enforced). If between merchants and non-merchants, the NOM clause on a merchant's form must be separately signed by the consumer.
• Common Law: NOM clauses are generally ineffective at common law; parties can orally modify an agreement regardless of what the prior contract says, because the oral modification operates as an implied agreement to modify the NOM clause itself.

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5. Promissory Estoppel: Detrimental Reliance (Restatement § 90)

Under Restatement (Second) of Contracts § 90, promissory estoppel serves as an equitable substitute for consideration when a gratuitous promise has induced detrimental reliance.

A. Four Essential Elements

1. A Clear and Definite Promise: The promisor makes an express promise to the promisee.
2. Reasonable and Foreseeable Reliance: The promisor should reasonably expect to induce action or forbearance of a definite and substantial character by the promisee.
3. Actual Detrimental Reliance: The promisee actually and reasonably takes action or refrains from acting in reliance upon the promise, suffering an economic injury.
4. Injustice Avoidable Only by Enforcement: Injustice can be avoided only by legal enforcement of the promise.

B. Measure of Recovery under Promissory Estoppel

Under modern contract law, the remedy granted for breach of an unbargained promise under § 90 may be limited as justice requires:

• While courts historically awarded full expectation damages (the value of the promise), the modern trend awards reliance damages (the actual out-of-pocket costs incurred by the promisee to restore them to the position they occupied before relying on the promise).
• Hypothetical: Uncle promises to give Niece $50,000 to buy a car. Relying on the promise, Niece spends $2,000 flying to an auto show and paying a non-refundable deposit on a vehicle. If Uncle repudiates, a court applying promissory estoppel may limit Niece's recovery to the $2,000 reliance loss rather than the full $50,000 promise.

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Comparison: Contract Modification & Consideration

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More on Consideration, Waiver, Reliance & Restitution

Settling Claims

• Forbearance as consideration: Forbearing to assert a claim, or giving up a claim, is consideration if the claim is doubtful because of uncertainty about the facts or law, or if the forbearing party believes in good faith that it may be valid (Restatement § 74).
• Something new: Paying less than a liquidated debt can support a discharge if the debtor gives something different—payment before the due date, at a different place, or in a different form.
• Checks marked "payment in full": Under UCC § 3-311, a claim is discharged if the debtor in good faith tenders an instrument with a conspicuous statement that it is offered in full satisfaction of a claim that is unliquidated or subject to a bona fide dispute, and the claimant obtains payment.

Conditional Gifts and Illusory Promises

• Condition or consideration? A promise to make a gift if the promisee comes to collect it is a conditional gift: the promisee's travel is a condition of the gift, not a bargained-for exchange (Kirksey v. Kirksey, 1845).
• Termination clauses: A promise that lets the promisor cancel at any time without notice is illusory, but a promise that requires advance notice before cancellation—or that is limited by a duty of good faith, as in requirements and output contracts—is consideration.

Waiver and Retraction Under UCC § 2-209(4)–(5)

An attempted modification that fails because it violates a no-oral-modification clause or the Statute of Frauds can still operate as a waiver. A party who has waived a term affecting an executory portion of the contract may retract the waiver by reasonable notification that strict performance will be required, unless retraction would be unjust in view of a material change of position in reliance on the waiver.

More on Promissory Estoppel

• Charitable subscriptions and marriage settlements: These are binding under § 90(2) without proof that the promise induced action or forbearance.
• Employment offers: A job applicant who resigns from existing employment in reliance on a promise of at-will employment, only to have the offer withdrawn before starting, may recover reliance damages (Grouse v. Group Health Plan, Inc., 1981).
• Reasonableness: Reliance must be reasonable and foreseeable; reliance on a vague statement of intention is not enough.

Restitution and Unjust Enrichment

Restitution (sometimes called quasi-contract or a contract "implied in law") is not based on a promise. It prevents unjust enrichment when the plaintiff conferred a benefit, the defendant knew of or appreciated it, and it would be unjust for the defendant to keep it without paying. Recovery is usually the reasonable value of the benefit (quantum meruit).

• Volunteers: A person who confers a benefit officiously—without request and when the recipient could have been asked—cannot recover, and a benefit intended as a gift is not recoverable.
• Emergencies: A professional who provides necessary emergency services to a person unable to consent, intending to charge, may recover their reasonable value (Cotnam v. Wisdom, 1907).
• Failed contracts: Restitution is also available when a contract is unenforceable, avoided, or discharged—for example, because of the Statute of Frauds, incapacity, mistake, or impossibility—for benefits conferred before the problem arose.