4. Offer and acceptance: unilateral contracts

This chapter analyses the formation of unilateral contracts. A unilateral contract arises where O promises A something if A does a particular act which is not the making of a promise to O. A unilateral contract only imposes obligations on O. A is not obliged to do anything. A unilateral offer can be accepted by A regardless of A’s motive for doing the required act. However, A must know of the offer in order for a contract to be formed. O may not be able to revoke the offer if A has embarked upon performance. This will depend upon whether or not O has made an implied promise not to revoke the offer.