Offer, Acceptance, and Consideration — an interactive formation lesson covering the Common Law and UCC divide, offers, termination, acceptance, the mailbox rule, consideration, and the bar exam formation pathway.
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Welcome to the foundation of Law School’s intensive on Contracts and Sales. This series is designed to take you from the basic “meeting of the minds” to the complex remedies of a breached multi-million dollar commercial deal.
Contracts are the lifeblood of the global economy. Without them, there is no trust; without trust, there is no commerce. Today, we focus on Formation. We are asking one fundamental question: When does the law stop seeing two people talking and start seeing a binding legal obligation?
Before we even look at a contract, we must identify the “Source of Law.” This is the first step in any bar exam question or legal analysis. If you apply the wrong set of rules, your entire conclusion will be wrong.
The Common Law governs contracts for Services, such as hiring a consultant, a doctor, or a coder, and Real Estate, such as buying land or a home. The Common Law is traditionally more rigid and formalistic. It values the “Mirror Image” of terms and rarely allows for missing terms to be filled in later.
The UCC governs the Sale of Goods. A “good” is defined as any tangible, movable object at the time of identification to the contract. This includes everything from a smartphone to a car to a sack of grain.
The “Merchant” Rules: The UCC often has special, stricter rules for “Merchants”—those who deal regularly in goods of the kind or hold themselves out as having special knowledge.
Gap-Filling: The UCC is “pro-contract.” If the parties intended to make a deal but forgot to mention the price or the delivery date, the UCC provides “gap-filler” provisions to save the deal.
What if you hire a company to install a new HVAC system? You are buying a good, the HVAC unit, and a service, the installation.
The Rule: We look for the “Predominant Purpose.” Was the main reason for the contract to get the goods or the service? If the main purpose was the HVAC unit, the UCC applies to the entire contract. If it was the installation labor, Common Law applies.
An offer is a manifestation of willingness to enter into a bargain. It gives the other person, the offeree, the “Power of Acceptance.”
To be a valid offer, the statement must meet three criteria:
Advertisements: Generally, ads are just “invitations to deal,” not offers. If an ad says “Laptops for $200,” and 1,000 people show up but the store only has 10, the store isn't in breach.
Advertisement Exception: If the ad is “First come, first served for one specific item,” it becomes an offer.
Price Quotes: Usually invitations to deal, unless they are sent in response to a specific inquiry and contain enough detail to be an offer.
Once an offer is made, it hangs in the air. It can be terminated before it becomes a contract in four ways:
Revocation means the offeror “takes it back.”
Rule: Offers are revocable at any time before acceptance, even if the offeror says “I'll keep this open for a week.”
Exceptions — Irrevocable Offers:
The offeree says “No.”
Counteroffer: Under Common Law, saying “I'll pay $400 instead of $500” is a rejection of the first offer and the creation of a new offer.
The offer expires after the stated time or a “reasonable time.”
If either party dies before acceptance, the offer dies with them. Note: A contract survives death, but an offer does not.
Acceptance is the offeree’s “Yes.” It must be communicated to the offeror.
Under Common Law, the acceptance must match the offer exactly—like a mirror. If the acceptance adds even a minor term, such as “I accept, but please use blue ink for the signature,” it is technically a counteroffer, and no contract is formed.
The UCC threw out the Mirror Image Rule to help businesses. If an acceptance adds new terms, a contract is still formed unless the offeree says “I only accept if you agree to these new terms.”
If both are Merchants: The new terms automatically become part of the deal unless they “materially alter” it or the other party objects.
This is the most famous rule in Contracts:
Strategic Note: If you mail an acceptance and then call to revoke, you are too late. The contract was born the second the letter hit the mailbox.
The law will not enforce a gift. To have a contract, there must be Consideration. This is a “bargained-for exchange of legal detriment.”
You must do something you weren't legally required to do, or refrain from doing something you had a legal right to do.
The law does not care if the deal is fair. You can sell a Ferrari for $100. As long as both sides “bargained” for it, the consideration is valid.
If a police officer catches a criminal and tries to claim a private reward, they can't. They already had a “pre-existing duty” to catch the criminal. There is no new consideration.
To find a contract, follow this path:
Next up: Day 2: Defenses to Formation. We will discuss what happens when there is a “meeting of the minds,” but one of the minds was a minor, was under duress, or was tricked by a lie.
Tap the card to flip between prompt and answer.
What law governs the sale of goods?
Under the Mailbox Rule, when is acceptance effective?
Save session notes while reviewing. Notes stay in this browser session.
For any formation problem, first identify the source of law. Apply Common Law to services and real estate, and UCC Article 2 to goods. For mixed contracts, apply the predominant purpose test. Then test offer: present objective intent, definite terms, and communication. Next ask whether the offer was terminated by revocation, rejection, lapse, death, or incapacity, and whether any irrevocability doctrine applies. Then analyze acceptance under the Common Law mirror image rule, UCC 2-207, and the Mailbox Rule. Finally, confirm consideration by finding a bargained-for exchange of legal detriment and avoiding the pre-existing duty trap.