于是，约因理论(doctrine of consideration)很快便得以确立。即便它未给无偿允诺(gratuitous promise)的执行提供依据，那又如何，在交易的时代，谁会真正在乎无偿赠与？
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Part four: The theory of consideration in Anglo-American law system.
第四部分：英美法系的约因理论。
参考来源 - 原因理论与约因理论比较研究Consideration theory in Anglo-American legal system make the consideration, offer and the promise to be trinity, and they think that they are the three aspects of a bargain which cannot be divided up.
英美法系的约因理论将约因、要约、承诺视为三位一体,认为这是交易的三个方面,这三个方面不可分割。
参考来源 - 论契约效力的根源·2,447,543篇论文数据，部分数据来源于NoteExpress
允诺禁反言是英美契约法中的一项重要规则，是衡平法对普通法中约因理论苛刻性的救济。
Promisary estoppel is an important rule in Anglo American Contract law and it is a kind of relief of Equity to rigid consideration theory of common law.
允诺禁反言是英美契约法中的一项重要规则 ，是衡平法对普通法中约因理论苛刻性的救济。
Promisary estoppel is an important rule in Anglo--American Contract Law and it is a kind of relief of Equity to rigid consideration theory of common law.
大陆法系许多国家的原因理论与普通法系国家的约因理论都是决定合同义务是否可以履行的重要条件。
The transactional nature of contracts should not be ignored. The doctrine of reason in many civil law countries and the theory of consideration of co…
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