North Carolina: No Jurisdiction for OutofState Injury Where "Last Act" in Making Employment Contract Occurred Outside State. The basic principle of Australian contract law is freedom of contract, under which parties are at liberty to strike whatever bargain they choose.Mutuality of agreement is a must. The parties to a contract must agree to the same thing inn the same sense. Global counsel across five continents. HR 4759 would implement the May 18, 2004 Agreement establishing a free trade area between the United States and Australia. Our business attorneys possess in-depth knowledge of the state contract laws and will formulate and scrutinize all the contractual terms and conditions. Mutuality of agreement is a must. The parties to a contract must agree to the same thing inn the same sense. See eg J W Carter, Contract Law in Australia.