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= Power of acceptance = Power of acceptance is a concept of contract law. It refers to the power vested in the offeree by the offeror through the offer being made. It is used in the offer and acceptance analysis to determine whether a contract is created.

Offer and acceptance analysis
The offeree can exercise the power of acceptance to create a binding contract with the offeror, provided that the power of acceptance is not revoked by the offeror. The manner in which the offeree may exercise such power is subject to the nature of the offer. The power can be terminated in a number of ways, either by the offeror, the offeree, or the operation of law.

Bilateral contract
A bilateral contract is created when there is an exchange of promises between the parties. An offeror makes a promise to an offeree, and that

Unilateral contract
A unilateral contract is created when there is a promise made by one party for an act by another party. The promisor assumes the obligation under the promise at the moment the promisee has performed the act which fully satisfies the conditions stated in the promise. However, once the promisee has begun to perform, an implied obligation may apply to the promisor that the promise cannot be revoked.

In the English case Carlill v Carbolic Smoke Ball Co.,

Expiration or lapse of offer
This is the most common way in which the power of acceptance can be terminated. If there is a specific date or period during which the offer must be accepted, then the power of acceptance remains valid until the end of that particular date or period.

When there is no date or period being specified in the offer, then the power of acceptance will lapse after a reasonable period of time.

Rejection by the offeree
The power of acceptance can also be terminated by the offeree by way of rejecting the offer made by the offeror.

Revocation of offer by the offeror
The power of acceptance can also be terminated by the offeror through revoking the offer, that is, taking back the offer. The general rule is that an effective revocation must be communicated to the offeree by the offeror.

Counteroffer by the offeree
The power of acceptance can also be terminated by the offeree by way of making a counteroffer. During negoations, the offeror and the offeree may propose different business terms on the same subject matter.