Freedom of trabsp;is the key publibsp;polibsp;that underpins the law of trabsp;and justifies a legally enforceable system of bargaining as a be to society.
The Law of Obligations is one of the po elements of the civil law system of law and enpass tractual obligations，quasi-tractual obligations subsp;as unjust enrit and extra-tractual obligations.The Law of Obligations is one of the branches of the civil law whibsp;includes the Law of Property，the Law of Persons，the Law of the Family，the Law of Successions，the Law of Hypothecs，the Law of Prescription.The Law of Obligations finds its ins in Roman law.
The Law of Obligations eks to anize and regulate the voluntary and mi-voluntary legal relations available between moral and natural persons under as（1）obligations under tracts，both innominate and nominate（for example：sales，gift，lea，carriage，mandate，association，deposit，loan，employment，insurance，gaming and arbitration）；（2）in unjust enrit；（3）ma of the property of another；（4）the reception of the thing not due and（5）the various forms of extra-tractual responsibility between persons known as delibsp;and quasi-delicts.
Then，what is an agreement？
L.B.Curzon defines an agreement in his “A Diary of Law” as “A sus of mind，or evidenbsp;of subsp;sus，in spoken or written form，relating to anything done or to be done.” And Blabsp;in his “Law Diary” defines an agreement as “A cord of uanding and iion between two or more parties with respebsp;to the effebsp;upon their relative rights and duties，of certain past or future fabsp;or performanbsp;of the “t of two or more persons curring respeg the transmission of some property，right or bes，with the view of tag an obligation，a mutual obligation.”