What is the "mirror image rule" in contract law?

The "mirror image rule" in contract law dictates that for an acceptance to create a binding contract, it must correspond exactly to the terms of the original offer. This means that the acceptance cannot introduce any new terms or alter the existing terms from the offer. When the acceptance is a precise match to what was offered, it reflects the offer like a mirror image, creating a valid contract.

This rule ensures clarity and mutual agreement between the parties involved. If the acceptance deviates in any way, even slightly, it is considered a counter-offer rather than an acceptance, which can lead to further negotiations rather than a finalized agreement. Understanding this rule is fundamental in guaranteeing that parties are on the same page regarding the terms of their engagement.