You’ve memorized the elements of offer and acceptance. You can spot a mirror image rule violation from a mile away. But when an MBE question asks whether consideration exists, you freeze. The fact pattern mentions a promise, maybe some money changing hands, maybe a waiver of rights — and suddenly you’re second-guessing whether there’s actually a bargained-for exchange.

Here’s the problem: consideration isn’t just about something being exchanged. It’s about why it’s being exchanged. The MBE tests whether you understand the difference between a binding contract and a gratuitous promise dressed up to look like one. Let’s break down exactly what the examiners are looking for.

What Consideration Actually Means on the MBE

Consideration is a bargained-for exchange of legal value. That definition has two moving parts, and both must be present:

  1. A promise induces a detriment (or return promise)
  2. The detriment induces the promise

This is the bargained-for exchange requirement. The parties must be dealing — each side gives something because they’re getting something in return. If one party’s promise is a gift, even if the other party does something in response, there’s no consideration.

Legal detriment means the promisee does something they have no legal obligation to do, or refrains from something they have a legal right to do. Notice it’s called a detriment, not a harm. The promisee doesn’t need to suffer. They just need to give up a legal right or assume a legal obligation they didn’t already have.

Here’s a classic example the MBE loves: Uncle promises Nephew $5,000 if Nephew refrains from drinking alcohol until age 21. Nephew already has no legal right to drink (he’s underage). Is there consideration? Yes — because Nephew has the legal right to drink once he turns 21, and he’s giving up that future right. The detriment is refraining from something he could legally do later.

The Bargained-For Requirement: Why Motive Matters

This is where students stumble. The MBE will give you a fact pattern where something of value changes hands, but it’s not actually bargained for.

Consider this hypo: Grandmother tells Granddaughter, “I’m so proud you graduated law school. I’m giving you $10,000.” Granddaughter says, “Thank you! I’ll use it to buy a car.” Granddaughter buys the car. Is there consideration?

No. Granddaughter suffered a detriment (she spent $10,000), but that detriment didn’t induce Grandmother’s promise. Grandmother made a gratuitous promise. The fact that Granddaughter did something with the money afterward doesn’t transform a gift into a contract.

Now tweak the facts: Grandmother says, “If you buy a reliable car for your new job, I’ll reimburse you $10,000.” Granddaughter buys the car. Now there’s consideration. Grandmother’s promise induced the purchase, and the purchase induced the promise. That’s a bargain.

The MBE tests this by inserting language that sounds conditional but isn’t actually bargained for. Watch for promises that say “because you did X” (past action, not bargained for) versus “if you do X” (future action, bargained for).

Past Consideration Is Not Consideration

Past consideration is a fancy term for “not consideration at all.” A promise given in exchange for something already done doesn’t satisfy the bargained-for requirement because it wasn’t bargained for — it already happened.

Hypo: Neighbor rescues your dog from traffic. Grateful, you promise to pay Neighbor $500. The next day you refuse to pay. Can Neighbor enforce your promise?

No. The rescue already occurred before you made the promise. Neighbor’s act wasn’t induced by your promise (Neighbor didn’t even know you’d promise anything). Your promise was gratuitous, motivated by past events.

There’s a narrow exception under Restatement section 86: A promise made in recognition of a benefit previously received may be binding to prevent injustice, unless the benefit was a gift or the value is disproportionate. This exception rarely appears on the MBE, but know it exists for a complete answer on an essay.

The Pre-Existing Duty Rule: Doing What You Already Owe

Here’s an MBE favorite: performing (or promising to perform) an existing legal obligation is not valid consideration. This is the pre-existing duty rule.

Hypo: Contractor agrees to build Homeowner’s deck for $10,000. Halfway through, Contractor says, “I underestimated costs. I need $12,000 or I’m walking off the job.” Homeowner, desperate to finish before summer, agrees to pay $12,000. Is the modification enforceable?

Under common law, no. Contractor already had a legal duty to build the deck for $10,000. Promising to do what you’re already obligated to do is not new consideration. Homeowner’s promise to pay more is not supported by consideration.

But watch for exceptions that make the modification enforceable:

Under the UCC, this rule doesn’t apply to modifications of contracts for the sale of goods. UCC section 2-209 requires only good faith for a modification — no new consideration needed. If the facts involve goods (anything movable and tangible), apply the UCC rule.

Adequacy of Consideration: Courts Don’t Care About Fair Deals

Here’s a relief: courts generally do not inquire into whether consideration is adequate. A peppercorn can support a promise to transfer land. Nominal consideration — even one dollar — is generally sufficient.

The MBE will tempt you with answers suggesting a contract is unenforceable because the deal was lopsided. Ignore them. Gross inadequacy of consideration is not a defense unless it’s evidence of fraud, duress, or unconscionability (separate defenses you’d need facts to support).

This rule applies even to option contracts (a promise to keep an offer open). One dollar is sufficient consideration to make an option irrevocable, even if the underlying deal involves a million-dollar property.

Illusory Promises: When One Side Isn’t Actually Bound

An illusory promise is one that doesn’t actually commit the promisor to do anything. If only one party is bound, there’s no consideration and no contract.

Hypo: Buyer agrees to purchase “as many widgets as I want to order” from Seller at $5 per widget. Seller agrees. Is there a contract?

No. Buyer’s promise is illusory — Buyer can order zero widgets and breach nothing. Buyer hasn’t suffered a legal detriment or assumed any obligation.

But courts try to save agreements by finding implied limitations. If the contract involves a requirements contract (Buyer agrees to purchase all widgets Buyer requires) or an output contract (Seller agrees to sell all widgets Seller produces), it’s enforceable under the UCC. The quantity is limited by good faith and cannot be unreasonably disproportionate to any stated estimate or prior requirements. That implied limitation makes the promise non-illusory.

Similarly, a promise that seems open-ended may be saved by an implied duty of good faith or best efforts. If Buyer promises to use “reasonable efforts” to sell Seller’s product, that’s not illusory — it’s a real obligation.

Promissory Estoppel: The Consideration Substitute

When there’s no consideration, look for promissory estoppel. It’s a consideration substitute that makes a promise enforceable when:

  1. A clear and definite promise was made
  2. The promisor should reasonably expect the promise to induce action or forbearance
  3. The promise does induce such action or forbearance
  4. Injustice can only be avoided by enforcing the promise

Hypo: Employer promises Employee a pension of $1,000 per month after retirement. Employee retires in reliance on that promise. Employer refuses to pay. Enforceable?

There’s no consideration (Employee’s retirement was not bargained for — Employee had no duty to keep working). But promissory estoppel applies. Employer should have expected Employee to rely on the pension promise by retiring. Employee did rely. Enforcing the promise prevents injustice.

Note that the remedy under promissory estoppel may be limited as justice requires. Employee might recover reliance damages (what Employee lost by retiring) rather than full expectation damages (the entire pension stream). The MBE may test this distinction.

How to Spot Consideration Issues on the MBE

When a Contracts question asks whether a promise is enforceable, work through this checklist:

  1. Is there a promise? (Not all statements are promises)
  2. What did the promisee give or promise in return? (Identify the alleged consideration)
  3. Is it legal detriment? (Did promisee do something they weren’t obligated to do, or refrain from something they had a right to do?)
  4. Was it bargained for? (Did the promise induce the detriment and vice versa, or was this a gift/past event?)
  5. Does an exception apply? (Pre-existing duty exceptions, UCC modification rules, promissory estoppel)

The examiners will bury the consideration issue in dense facts. You might see a question about whether a modification is enforceable (pre-existing duty rule), whether a settlement agreement binds both parties (was the claim disputed?), or whether a promise to make a gift is enforceable (no consideration, but maybe promissory estoppel).

What You Must Memorize

Lock in these rules for test day:

Consideration = bargained-for exchange of legal value. Both the promise and the detriment must induce each other.

Legal detriment = doing something you have no legal duty to do, or refraining from something you have a legal right to do.

Past consideration = not consideration. Something already done before the promise cannot be bargained for.

Pre-existing duty rule = performing an existing legal obligation is not valid consideration. Exceptions: new consideration, unforeseen circumstances, duty owed to third party, honest dispute.

UCC modification = no new consideration required, only good faith (UCC section 2-209).

Illusory promise = not valid consideration. Look for implied limitations (good faith, requirements/output contracts) that save the promise.

Promissory estoppel = consideration substitute. Requires clear promise + reasonable expectation of reliance + actual reliance + injustice.

Adequacy = courts don’t care. Even nominal consideration ($1) suffices unless there’s fraud, duress, or unconscionability.

The MBE loves testing consideration in modification hypos, settlement agreements, and option contracts. If you can spot whether something was bargained for versus gratuitous, you’ll handle these questions confidently. FlashTables organizes all 27 formation rules — including every consideration exception and substitute — in a two-column format built for active recall. When you’re drilling through practice questions and need to verify whether the pre-existing duty rule or a UCC exception applies, having the elements side-by-side makes pattern recognition automatic.

Master the bargained-for exchange concept, and you’ll stop second-guessing yourself when consideration appears on test day. The rule is simpler than it looks: both sides must be dealing. If it’s a deal, there’s consideration. If it’s a gift with conditions attached, there isn’t.