目次一、对价与约因的含义二、约因与对价的历史回顾三、英美法对价理论的基本内容四、传统对价理论的缺陷五、对对价理论的批评六、约因理论的批评与反批评七、英美法“信赖”理论的发展与“契约死亡”论八、结语合同是能够依法强制履行的允诺或协议。英美法用“允诺”来定义合同;大陆法强调双方意思表示的一致即“协议”。并非所 First, the meaning of the consideration and the reason Second, about the historical review of the consideration and the price Third, the basic content of the Anglo-American legal theory Fourth, the traditional theory of the defects of the price Five, the theory of the price of criticism Six, about the theory of criticism and anti-criticism VII. Anglo-American Law “Theory of Trust ” Development and “Contract Death ” VIII. Conclusions A contract is a promise or agreement that can be enforced legally. The Anglo-American law defines the contract with “promise ”; and the civil law emphasizes that the agreement of both parties means “agreement ”. Not the