Study guide
3.3 Promissory Estoppel & Detrimental Reliance
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1 Introduction & FYLSE Examination Guide
1.1 FYLSE Exam Structure, Passing Standard & Administration 1.2 Study Method, Pacing & MBE-Style Technique
2 Contracts: Mutual Assent, Capacity & Contract Formation
2.1 The Offer & Objective Theory of Assent 2.2 Termination & Irrevocability of Offers 2.3 Acceptance & the Mailbox Rule 2.4 Mirror Image Rule & UCC 2-207 Battle of the Forms 2.5 Mistake in Contract Formation 2.6 Fraud, Duress, Undue Influence & Illegality 2.7 Capacity to Contract
3 Contracts: Consideration, Estoppel & Implied Obligations
3.1 Consideration & the Bargained-For Exchange 3.2 Past & Moral Consideration, Pre-Existing Duty & Modification 3.3 Promissory Estoppel & Detrimental Reliance 3.4 Implied-in-Fact Contracts & Quasi-Contract 3.5 Implied Covenant of Good Faith, Fair Dealing & Indefinite Terms
4 Contracts: Third-Party Beneficiaries, Assignment & Delegation
4.1 Third-Party Beneficiary Contracts 4.2 Assignment of Rights 4.3 Delegation of Duties
5 Contracts: Statute of Frauds, Parol Evidence & Interpretation
5.1 Statute of Frauds: Contracts Within the Statute 5.2 Satisfying the Statute: Writing, Signature & Exceptions 5.3 The Parol Evidence Rule 5.4 Contract Interpretation & Canons of Construction
6 Contracts: Performance, Conditions, UCC Warranties & Breach
6.1 Conditions: Express, Constructive & Excuse 6.2 Substantial Performance vs. Perfect Tender 6.3 Cure, Rejection, Revocation & Installment Contracts 6.4 UCC Article 2 Warranties & Risk of Loss 6.5 Anticipatory Repudiation & Insecurity
7 Contracts: Remedies, Discharge & Changed Circumstances
7.1 Expectation Damages & Their Limitations 7.2 Reliance, Restitution & Liquidated Damages 7.3 Specific Performance & Injunctive Relief 7.4 UCC Article 2 Buyer's and Seller's Remedies 7.5 Impossibility, Impracticability & Frustration of Purpose 7.6 Discharge by Agreement: Rescission, Novation & Accord and Satisfaction
8 Criminal Law: Principles of Criminal Liability & Mens Rea
8.1 Actus Reus, Voluntary Acts & Omissions 8.2 Criminal Causation & Intervening Causes 8.3 Common Law & Model Penal Code Mens Rea 8.4 Mistake of Fact, Mistake of Law & Concurrence
9 Criminal Law: Inchoate Offenses & Accomplice Liability
9.1 Criminal Attempt & Impossibility 9.2 Solicitation & the Merger Doctrine 9.3 Conspiracy & Merger Doctrine 9.4 Accomplice Liability: Actus Reus & Mens Rea 9.5 Scope of Accomplice Liability, Withdrawal & Parties to Crime
10 Criminal Law: Homicide & Crimes Against the Person
10.1 Common Law Murder & Malice Aforethought 10.2 Degrees of Murder, Premeditation & Deliberation 10.3 The Felony Murder Rule & Its Limitations 10.4 Voluntary & Involuntary Manslaughter 10.5 Non-Homicide Crimes Against the Person
11 Criminal Law: Property Crimes, Theft & Habitation
11.1 Common Law Larceny 11.2 Embezzlement & False Pretenses 11.3 Robbery & Extortion 11.4 Receiving Stolen Property 11.5 Burglary 11.6 Arson
12 Criminal Law: Defenses: Capacity, Justification & Excuse
12.1 Insanity: The Four Legal Tests 12.2 Intoxication, Diminished Capacity & Infancy 12.3 Self-Defense & Defense of Others 12.4 Defense of Property, Habitation & Law Enforcement Privileges 12.5 Duress & Necessity 12.6 Entrapment & Mistake as an Excuse
13 Torts: Intentional Torts to Persons & Property
13.1 Intent, Motive & Incapacity in Intentional Torts 13.2 Transferred Intent 13.3 Battery & Assault 13.4 False Imprisonment 13.5 Trespass to Land 13.6 Trespass to Chattels & Conversion
14 Torts: Privileges & Defenses to Intentional Torts
14.1 Consent: Express, Implied & Capacity 14.2 Exceeding & Vitiating Consent 14.3 Self-Defense & Defense of Others (Tort) 14.4 Defense of Property & Recapture of Chattels 14.5 Public & Private Necessity 14.6 The Shopkeeper's Privilege
15 Torts: Negligence — Duty of Care & Breach
15.1 Duty of Care & the Foreseeable Plaintiff 15.2 Affirmative Duties to Act & Special Relationships 15.3 Standard of Care: The Reasonable Person & Children 15.4 Professional Negligence, Informed Consent & Negligence Per Se 15.5 Land Possessor Liability & Premises Duties 15.6 Breach of Duty & Res Ipsa Loquitur
16 Torts: Causation, Defenses, Multiple Tortfeasors, Wrongful Death & Damages
16.1 Cause in Fact & Multiple Actors 16.2 Proximate Cause & Intervening Forces 16.3 Contributory, Comparative Negligence & Assumption of Risk 16.4 Joint and Several Liability, Contribution & Indemnity 16.5 Vicarious Liability & Non-Delegable Duties 16.6 Wrongful Death & Survival Actions 16.7 Statute of Limitations & Claim Accrual 16.8 Tort Damages: Compensatory, Nominal, Punitive & Mitigation
17 Torts: Strict Liability & Products Liability
17.1 Strict Liability for Animals 17.2 Abnormally Dangerous Activities & Scope of Risk 17.3 Strict Products Liability & Defect Categories 17.4 Products Liability Under Negligence, Warranty & Misrepresentation 17.5 Defenses to Products Liability
18 Torts: Emotional Distress, Defamation, Privacy & Economic Torts
18.1 Intentional Infliction of Emotional Distress 18.2 Negligent Infliction of Emotional Distress 18.3 Common Law Defamation: Elements, Libel & Slander 18.4 Constitutional Limits, Privileges & Defenses to Defamation 18.5 Invasion of Privacy 18.6 Nuisance & Economic Torts
3.3 Promissory Estoppel & Detrimental Reliance
Key Takeaways Explain This Topic AI
Promissory estoppel enforces a promise the promisor should reasonably expect to induce action or forbearance, where the promise does induce it and injustice can be avoided only by enforcement.
The doctrine is a consideration substitute, so it is reached only after concluding that no bargained-for exchange exists.
Reliance must be actual, reasonable, and detrimental; mere disappointment is not detriment.
Restatement (Second) section 90 allows the remedy to be limited as justice requires, so courts frequently award reliance damages rather than the full expectation interest.
Last updated: September 2026
Promissory Estoppel & Detrimental Reliance
Quick Answer: When formal contract formation fails for lack of consideration or failure of assent, plaintiffs have two primary legal avenues of recovery: promissory estoppel (detrimental reliance under Restatement (Second) § 90) and quasi-contract (unjust enrichment / quantum meruit). Promissory estoppel acts as a consideration substitute enforcing a gratuitous promise where the promisor foreseeably induces actual, reasonable reliance to the promisee's detriment. In contrast, quasi-contract is an equitable remedy implied in law where no promise exists, but the defendant has retained a measurable benefit conferred by the plaintiff under circumstances where retention without payment would be unjust.
Promissory Estoppel: Restatement (Second) § 90
The doctrine of promissory estoppel operates as an equitable substitute for consideration. Under Restatement (Second) of Contracts § 90 , a promise that lacks bargained-for consideration may nonetheless be enforced if four elements are satisfied:
A Clear and Definite Promise: The promisor must make a promise that is sufficiently clear, definite, and unambiguous so that the promisee could reasonably understand it as a binding commitment.
Reasonable Expectation of Inducement (Foreseeability): The promisor must have reasonably expected, or should have foreseen, that the promise would induce action or forbearance of a definite and substantial character on the part of the promisee.
Actual and Reasonable Detrimental Reliance: The promisee must in fact rely upon the promise, and such reliance must be both actual (the promisee altered their position) and objectively reasonable .
Injustice Can Be Avoided Only by Enforcement: Enforcement is necessary to prevent severe injustice to the promisee.
Origins and Historical Evolution
Ricketts v. Scothorn (1898): A grandfather handed his granddaughter a promissory note for $2,000 payable on demand with 6% interest, stating: "I have fixed out something that you have not got to work any more. None of my grandchildren work, and you don't have to." In reliance on the note, the granddaughter immediately quit her job as a bookkeeper. After the grandfather died without paying the note, his estate resisted payment for lack of consideration. The Nebraska Supreme Court held that while the note was a gift lacking bargained-for exchange, the grandfather intentionally induced the granddaughter to abandon her livelihood to her detriment. The estate was estopped from asserting lack of consideration.
Subcontractor Bids: Drennan v. Star Paving Co. (1958)
In construction bidding, general contractors rely on bids submitted by subcontractors to compile their master proposals to project owners. In Drennan v. Star Paving Co. , Justice Traynor held that a subcontractor's bid constitutes a promise that the subcontractor reasonably expects will induce the general contractor to incorporate the figure into the prime bid. Under Restatement § 90, the subcontractor's bid becomes an irrevocable option contract for a reasonable time to permit the general contractor to accept after being awarded the prime contract.
Charitable Subscriptions
Under early common law, pledges to churches, universities, and charities were often deemed unenforceable gratuitous promises unless the charity could prove specific, identifiable expenditures made in direct reliance on that specific pledge. Under Restatement (Second) § 90(2) , modern law has simplified this standard:
Restatement (Second) § 90(2): "A charitable subscription or a marriage settlement is binding under Subsection (1) without proof that the promise induced action or forbearance."
Many modern jurisdictions enforce charitable pledges on public policy grounds without requiring affirmative proof of detrimental reliance.
Promissory Estoppel Remedies: Reliance vs. Expectation
A critical FYLSE issue is determining the proper measure of damages when a plaintiff prevails on a promissory estoppel theory. Restatement (Second) § 90 Remedial Flexibility:
- "The remedy granted for breach may be limited as justice requires."
- Two Competing Remedial Approaches
Remedy Type Goal of Award Standard Application on Exam
Reliance Damages Restores the promisee to the status quo ante (position occupied before the promise was made). Compensates out-of-pocket expenses and quantifiable losses. The traditional and dominant approach when expectation damages would yield a disproportionate windfall.
Expectation Damages Places the promisee in the position they would have occupied had the promise been fully performed (the full value of the promised performance). Granted when reliance is complete, performance was almost finished, or calculation of reliance is impracticable.
Example: An uncle promises to give his niece a $50,000 sports car for graduation. In reliance, the niece spends $800 taking advanced high-performance driving lessons. If the uncle revokes the promise, the niece cannot recover the $50,000 car (expectation interest) under a pure reliance theory; justice is satisfied by awarding the $800 spent on lessons (reliance interest).