L’étude du renouvellement normatif du droit des contrats conduit à présenter le phénomène avant d’envisager sa portée. En premier lieu, ce phénomène est aisément observable et met en évidence deux crises : une « crise de croissance » et une « crise de normativité ». Toutes deux confirment une tendance à l’instrumentalisation des normes qui se veulent désormais harmonisatrices, protectrices, modèles ou encore persuasives. La part de nouveauté réside dans leur texture, leur élaboration ou encore leur mise en œuvre. Et les difficultés engendrées par ce renouvellement concernent l’articulation des diverses normes qui régissent le droit des contrats, ainsi que leur intégration au sein de l’ordre juridique interne.En second lieu, il s’agit de se questionner sur l’intérêt et l’influence de ce renouvellement à travers sa capacité à produire des effets sur le modèle contractuel. Au regard de la récente réforme, le renouvellement normatif a vraisemblablement participé à la modernisation du Code civil puisque des mouvements convergents vers la souplesse contractuelle et la sécurité juridique sont observés. Cependant, la limite des effets de ce renouvellement apparaît car il ne provoque pas une modélisation du droit des contrats qui permettrait de maintenir une cohérence malgré les transformations majeures à l’œuvre en la matière. / The study of the normative renewal of contract law requires a general presentation of the phenomenon before taking an in-depth look at its impact. Firstly, this phenomenon is easily noticeable and calls attention to two crisis : a “growth crisis” and a “normative crisis”. Both highlight a tendency to exploit norms by making them instruments of harmonization, protection, standardization or persuasion. The innovation comes from their substance, their elaboration or their enforcement, however, the articulation of the various contract law norms and their integration within the domestic legal order raise many issues that need to be addressed. Secondly, this renewal’s potentiality to influence and impact contractual models needs to be questioned. Taking the recent reform into account, it seems that the normative renewal has taken a major role in the modernization of the Civil code. Indeed, converging movements towards both contractual flexibility and legal security are visible. However, this normative renewal movement is still unable to promote a modelling of contract law that would allow it to maintain its coherence in spite of the major transformations taking place. As such, the normative renewal of contract law shows its limits.

What makes real life contractual arrangements? How does the law influence real life contractual arrangements? These are everyday questions for businesspeople and commercial lawyers. The traditional ‘imperative’ view of law assumes that business people contract ‘in the shadow of the law’ and contractual arrangements conform to what the law says. But empirical studies on contract practice suggest that contract law may, in fact, play a very insignificant role in real life contractual arrangements. This thesis provides a sociological view of the role of contract law in real life contractual arrangements in the context of the Vietnamese market. Specifically, this thesis applies an institutional law & economics approach to investigate how social structures of the market influence contractual arrangements to marginalize contract law in the Vietnamese market. Drawing on two surveys of contract behaviour in the Vietnamese market, this thesis finds that real life contractual arrangements respond to the institutional structure of the market as a whole, rather than only ‘the shadow of the law’. Institutional changes in the Vietnamese market suggest that there exists a merchant law system, constituted of traditional moral norms and social structures in the market. This merchant law system continues to order contractual arrangements in the market, despite the introduction of a transplanted contract law system. Disagreeing with the imperative approach, this thesis claims that contract law reform should conform to the institutional structure of the market to reduce transaction costs of contracting and to provide an effective framework for real life contractual arrangements.