本文對普通法中的誠信義務進行了研究。整個研究分為五個部分，討論了近年來普通法下誠信的新趨勢，特別是Yam Seng Pte Ltd訴International Trade Corp Ltd，第一部分介紹了普通法體系中誠信義務的傳統和新趨勢。第二部分分析了誠信的概念、立法規定。第三部分是本文最重要的部分，即Yam Seng Pte Ltd訴International Trade Corp Ltd的案例研究。第五部分在理論基礎和案例分析的基礎上，提出了誠信未來的前景和發展趨勢。最后得出了整個研究的結論。
This essay studies on the duty of good faith in the common law. The whole study was divided into five sections, which have discussed the new trend of good faith in recent cases under the common law, especially Yam Seng Pte Ltd v International Trade Corp Ltd. The first part introduces the traditions and new trend of the duty of good faith in the common law system. The second part analyzes the concept, and legislative stipulation of good faith. Third part refers case study of Yam Seng Pte Ltd v International Trade Corp Ltd which is the most important section of this essay. Based on theoretical base and case analyses, fifth part puts forth the prospect and development trend of good faith in the future. Finally it draws conclusion of the whole study.
Table of Contents
1. Introduction 3
2. The Duty of Good Faith in the Common Law 4
2.1 Concept of Good Faith 4
2.2 legislative Stipulation of Good Faith 5
3. Case Analysis: Yam Seng Pte Ltd v International Trade Corp Ltd case 7
3.1 Overview of the case 7
3.2 Good faith as an implied term in the contract 8
4. Prospect of the Duty of Good Faith in the Common Law 9
5. Conclusion 10
Good faith is an important doctrine of contract law. In English contract, good faith can be seen everywhere, which creating an illusion that in the contract the so-called “good faith” means a party has an obligation to the other party. In continental law system, the doctrine of good faith is considered as an “empire provision” which reigns for the contract law. In China, both the General Principles of the Civil Law and the Contract Law adapt the doctrine of good faith, and further clearly integrating good faith as one of the principles which must be complied by the civil subject when exercising rights and performing obligations. The judge will take the initiative to apply the doctrine of good faith in some judicial cases, especially when some behaviors have not expressly agreed upon in the contract or when need to perform the contract according to good faith. However, under the traditional English law system, which is different with continental law system, there is not a so-called good faith doctrine. The reason why the English law has certain hostility to the doctrine of good faith for quite a long time, on the one hand lies in the tradition of contract freedom, as long as one party is not do misrepresentation or fraud in the deal, who will not bear any obligation of the so-called general good faith to the other party; on the other hand, the reason lies in the business requirements, it is less likely to require the business subject acting in “good faith”, because the nature of business subject is chasing profits, which have limited the business morality.
In the case Walford v.Miles  2 AC 128, Lord Ackner has said, “[H]ow can a court be expected to decidewhether, subjectively, a proper reason existed for the termination ofnegotiations? The answer suggested depends upon whether the negotiations havebeen determined ‘in good faith’. However, the concept of a duty to carry on negotiations in good faith isinherently repugnant to the adversarial position of the parties when involvedin negotiations. Eachparty to the negotiations is entitled to pursue his (or her) own interest, solong as he avoids making misrepresentations. To advance that interest hemust be entit