Valid Offer in Contract Law: The Ultimate MBE Guide

Introduction: Unlocking the Mystery of a Valid Offer

You are sitting in Torts class, but your mind is drifting to Contracts. You recall your professor hiding the ball, asking Socratic questions about whether a joke on a napkin counts as a binding agreement. You walked away confused.

Here is the reality: The "offer" is the gatekeeper of contract law. If you don't have a valid offer, you don't have a contract, and you certainly don't have a cause of action for breach.

In law school and on the bar exam, understanding the offer isn't just about memorizing a definition. It is about recognizing the precise moment legal liability attaches. Master this, and you stop guessing on the MBE and start knowing.

In this guide, we are going to strip away the academic fluff. We will look at the objective intent, the difference between an ad and an offer, and the specific ways an offer dies. This is the breakdown your professor won't give you—straight, practical, and exam-focused.

1. What Exactly Is an Offer?

To analyze a fact pattern like a pro, you need to look at the situation through the lens of the "Objective Theory of Contracts."

Your professor might have spent days discussing what the parties felt inside their hearts. For the bar exam, that doesn't matter. The law judges intent by outward manifestations—what a reasonable person in the position of the offeree would believe.

A valid offer requires three specific components:

A manifestation of present intent to be bound,
Definite and certain terms, and
Communication to an identified offeree.

If any of these are missing, you are likely looking at a preliminary negotiation, not an offer.

The Landmark Case: Lucy v. Zehmer

You cannot discuss offers without referencing Lucy v. Zehmer. In this case, two men were drinking at a bar. One wrote a contract to sell his farm on the back of a restaurant check. Later, he claimed he was joking. The court held that his secret intent (the joke) was irrelevant because his objective actions (writing and signing the paper) signaled a serious intent to sell.

Trigger: If you see a fact pattern involving a "joke" or "bluff," ask: Would a reasonable person realize it was a joke? If not, it’s a valid offer.

2. Definite and Certain Terms: The "Must-Haves"

This is where the Common Law and the UCC diverge, and it is a favorite testing area for the MBE. You need to identify which law applies immediately.

Common Law (Real Estate & Services)

Under Common Law, the terms must be incredibly specific. To be valid, the offer generally needs to include:

The parties
The subject matter
The price
The quantity

If the price is missing in a services contract, a court might imply a reasonable rate, but for real estate, a missing price usually kills the offer.

UCC Article 2 (Sale of Goods)

The UCC is much more forgiving. It wants to keep commerce moving. For a sale of goods, the only truly essential term is quantity. If the price is missing, the court can plug in a "reasonable price" at the time of delivery.

Most-Missed MBE Nuance: Students often think an offer fails under the UCC because it lacks a price term. It doesn't. However, if the quantity is missing, the offer fails (unless it is an output or requirements contract).

Requirement	Common Law (Services/Real Estate)	UCC Article 2 (Goods)
Price Term	Essential (generally)	Not Essential (can be gap-filled)
Quantity	Essential	Essential
Subject Matter	Essential	Essential
Parties	Essential	Essential

3. Advertisements: Offer or Invitation?

We cover the basics of the "3-Element Test" in our Guide to the Offer, but let's go deeper into the most common trap: the advertisement.

The general rule is that advertisements, catalogs, and price lists are invitations to treat (invitations to receive offers), not offers themselves. If a store advertises TVs for $500, they are not making an offer to the whole world; they are inviting you to come in and offer to buy one.

The Exception: Lefkowitz v. Great Minneapolis Surplus Store

An advertisement can be an offer if it is clear, definite, explicit, and leaves nothing open for negotiation.

In Lefkowitz, the store advertised a specific fur stole for $1 to the "first come, first served." Because the ad specified who could accept (the first person) and what they would get, it was a binding offer.

Trigger: Look for "First come, first served" or specific language promising a reward for a specific act. These transform a generic ad into a valid unilateral offer.

4. When Does an Offer End? Termination Explained

An offer doesn't live forever. To analyze formation, you must check if the offer was still "alive" when the acceptance occurred.

Revocation

The offeror is the master of the offer. Generally, they can revoke the offer at any time before acceptance, even if they promised to keep it open (unless there is consideration, which we will discuss in Section 5).

Critical Rule: Revocation is effective only upon receipt.

Rejection and Counteroffers

If the offeree says "No," the offer dies. It cannot be revived later.

Counteroffer: A counteroffer acts as a rejection and a new offer. If I offer to sell my car for $10,000 and you say, "I'll give you $9,000," my original offer is dead. You cannot later say, "Okay, fine, I'll take it for $10,000."
Mere Inquiry: Distinguish a counteroffer from a "mere inquiry." If you say, "Would you consider $9,000?" you are keeping the original offer alive while testing the waters.

Common Confusion: Students often confuse a counteroffer with a mere inquiry.

"I will only pay $9,000" = Counteroffer (Rejection).
"Would you take $9,000?" = Inquiry (Original offer survives).

Lapse of Time

If no time is specified, an offer lapses after a "reasonable time." What is reasonable depends on the context (e.g., an offer to buy bananas rots faster than an offer to buy land).

5. Irrevocable Offers: The Exceptions

This is where the bar exam tests your ability to distinguish between a casual promise and a binding legal obligation. Generally, offers are revocable. However, there are four main exceptions where an offeror's hands are tied.

(A) Option Contracts (Common Law)

You pay for time. If the offeree gives consideration (money) to keep the offer open, the offeror cannot revoke it for that period.

(B) UCC Firm Offer (§ 2-205)

This is a massive trigger area. A merchant can make an irrevocable offer without consideration if:

The offeror is a merchant.
The offer is in a signed writing.
The writing gives explicit assurance it will be held open.

Note: The irrevocability period cannot exceed three months.

(C) Detrimental Reliance (Promissory Estoppel)

If the offeree reasonably and foreseeably relies on the offer to their detriment (e.g., a general contractor using a subcontractor's bid), the offer may become irrevocable.

(D) Unilateral Contract Performance

In a unilateral contract (promise for performance), once the offeree begins actual performance, the offeror cannot revoke. Preparing to perform is usually not enough; they must start the job.

Trigger: "Merchant" + "Signed Writing" → check for UCC Firm Offer rules.

Feature	Option Contract	UCC Firm Offer
Law	Common Law or UCC	UCC Only
Consideration Required?	✅ Yes	❌ No
Writing Required?	❌ No (unless SoF applies)	✅ Yes
Merchant Required?	❌ No	✅ Yes
Time Limit	Whatever is agreed	Max 3 months

For a broader look at how these rules fit into the bigger picture of formation, check out our Contracts: Offer, Acceptance, and Defenses Guide.

6. The "Battle of the Forms" Preview

While we are focusing on the offer, you must know how the UCC treats the response to an offer. Under Common Law, the "Mirror Image Rule" says acceptance must match the offer exactly. If it doesn't, it's a counteroffer (rejection).

Under UCC § 2-207, an acceptance with additional terms is still a valid acceptance. The question then becomes: Do those new terms enter the contract?

Non-Merchants: The new terms are proposals.
Merchants: The new terms become part of the contract unless they materially alter it, the offer limited acceptance, or the offeror objects.

This distinction is crucial when analyzing whether an "acceptance" killed the offer or formed a contract.

Trigger: "Subject to terms on reverse" or standard purchase orders usually signals a UCC § 2-207 analysis.

7. Bar Exam Strategy: Spotting the Trick

When you see a Contracts essay or MBE question, start with the formation hierarchy.

Is it a sale of goods? (UCC vs. Common Law).
Is there a valid offer? Look for intent and definite terms.
Was the offer terminated? Check the timeline. Did a revocation arrive before the acceptance was mailed? (Remember the Mailbox Rule applies to acceptance, not revocation).
Is the offer irrevocable? Did the offeree pay for an option? Is it a signed merchant's firm offer?

If you skip these steps and jump straight to "breach," you will miss the easy points on formation.

Quick Recap: Your Valid Offer Checklist

Intent: Would a reasonable person think it's serious?
Terms: Are the parties, subject, and quantity clear?
Communication: Did the offeree know about the offer?
Alive: Has it been revoked, rejected, or lapsed?

If you are struggling with the writing requirement for certain contracts, review our Statute of Frauds Simplified Guide to ensure you don't form a valid oral offer that is ultimately unenforceable.

Frequently Asked Questions

Q: Can a text message be a valid offer?

A: Absolutely. As long as it shows present intent, definite terms, and is communicated, the medium (text, email, napkin) does not matter.

Q: What happens if the offeror dies?

A: The offer dies with them. You cannot accept an offer from a dead person unless it was an irrevocable option contract. In that case, the estate must honor it.

Q: Is a price quote an offer?

A: generally, no. Price quotes are usually invitations to treat. However, if the quote is in response to a specific inquiry and contains definite terms (quantity, delivery date), courts may treat it as an offer.

This article is part of our comprehensive guide to contract formation. For the complete picture of how offer, acceptance, consideration, and mutual assent work together, see: The Critical 4-Part Test for Contract Formation Success.

Closing Thoughts

The "secret" to the valid offer isn't a hidden rule; it is the discipline to apply the objective standard every single time. Don't look for what is "fair"—look for what was communicated.

When you sit down to practice, stop reading the facts passively. Hunt for the "must-haves." Hunt for the quantity term. Hunt for the signature on the merchant's letter.

Contracts is a game of rules. Once you know the rules of the game, you can stop worrying about being tricked and start stacking points.

Try this: Go to the Contracts Outline in Study Mode and drill the "Termination of Offer" section. Pay specific attention to the difference between Option Contracts and Firm Offers.

Go deeper: Study our comprehensive Contracts outlines to master formation, consideration, defenses, and every rule for your exams.