Consideration in Contract Law Explained Simply

Consideration is a bargained-for exchange of legal value between the parties to a contract. It's one of the essential elements for a valid contract (along with offer, acceptance, and capacity). Without consideration, a promise is generally unenforceable — it's just a gift. The key idea: each party must give something or promise something in exchange for the other party's promise.

For consideration to exist, two things must be true:

1. Bargained-for exchange: The promise must induce the other party to give something in return, and vice versa. It's a mutual exchange, not a one-way gift.

2. Legal value: Each party must either (a) do something they're not legally obligated to do, (b) refrain from something they have a legal right to do, or (c) change their legal position in some way.

Hamer v. Sidway: Uncle promises nephew $5,000 if he refrains from drinking and smoking until age 21. The nephew's forbearance is consideration — he gave up a legal right.

Employment contracts: Employee's labor is consideration for employer's payment, and vice versa.

Not consideration: “I promise to give you $500” with nothing in return — this is a gratuitous promise (gift) and generally unenforceable.

Past consideration is not consideration. “Because you saved my life last week, I promise to pay you $1,000.” The saving already happened — it wasn't bargained for.

Adequacy doesn't matter. Courts don't evaluate whether the exchange was “fair.” A peppercorn can be consideration for a house — what matters is that something was exchanged, not whether it was proportional.

Pre-existing duty rule: Promising to do something you're already obligated to do is not new consideration. (Exception: unforeseen circumstances under the Restatement.)

When there's no consideration, a promise may still be enforced under:

Promissory estoppel: If the promisee reasonably relied on the promise to their detriment (Ricketts v. Scothorn)

Moral obligation + material benefit: Some jurisdictions enforce promises made in recognition of a past material benefit (Webb v. McGowin)

Promises under seal: Historically enforceable without consideration, though this is largely obsolete