When an offer is made by mail and contains no stipulations for acceptance, the agreement is completed when the acceptance is what?

The agreement is completed when the acceptance is placed in the mail by the offeree because of the mailbox rule in contract law. This rule states that an acceptance is considered valid and effective once it is dispatched, meaning when it is placed in the mail. The rationale behind this rule is that it protects the offeree from uncertainties regarding communication and ensures that as soon as they have taken the action of mailing their acceptance, they can be assured that a contract has been formed, irrespective of whether the offeror receives it immediately or at all.

In this context, since the offer contains no stipulations for acceptance, sending the acceptance by mail is deemed sufficient to create a binding contract as soon as it is sent, not necessarily when it reaches the other party. This contrasts with other methods of communication like personal delivery, electronic sending, or verbal agreements, which would have different criteria for when an agreement is considered complete.