The Oxford Commentaries on American LawFOUNDATIONALPRINCIPLES OFCONTRACT LAWMelvin A.EisenbergFOUNDATIONAL PRINCIPLESOF CONTRACT LAWThe Oxford Commentarieson American LawThe Editorial Advisory BoardThe Honorable Morris S.ArnoldSenior Judge,United States Court of Appeals for the Eighth CircuitThe Honorable Drew S.Days IIIAlfred M.Rankin Professor Emeritus and Professorial Lecturer in Law,Yale Law School,andFormer Solicitor General of the United StatesJames H.CarterSenior Counsel,WilmerHale,New YorkThe Honorable Harry T.EdwardsSenior Judge,United States Court of Appeals for the District of Columbia CircuitMichael GrecoOf Counsel,K&L Gates LLB andFormer President,American Bar AssociationRichard H.Helmholz,Ruth Wyatt Rosenson Distinguished Service Professor of LawThe University of Chicago Law SchoolMary Kay KaneChancellor and Dean EmeritaUniversity of California,Hastings College of the LawLance LiebmanWilliam S.Beinecke Professor of Law,Columbia University Law School,andDirector Emeritus,American Law InstituteKent McKeeverDirector,Diamond Law Library,Columbia University Law SchoolAlberto J.MoraSenior Fellow,Carr Center for Human Rights Policy,Harvard University andFormer General Counsel,United States NavyJoseph W.SingerBussey Professor of Law,Harvard Law SchoolMichael TraynorPresident Emeritus,American Law InstituteStephen M.Sheppard,ChairDean and Charles E.Cantu Distinguished Professor of Law,St.Mary's University School of Law