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The ultimate goal of game theory is to provide a theoretical model for strategic situations' analysis, i.e. for situations where one actor's choice depends on the behavior of other players in the game. As a concept, game theory is also applicable to the legal context. Legal dialectics and processes are often conducted in some form of strategic interactions. Game theory is a way to see how legal rules affect particular actors' behavior. International Economic Law has its own dynamics which makes the process similar to the analysis through the game theoretical tools. Therefore, the rules of international law are considered as the rules of the game that are taking place among different actors. Game theoretical considerations clarify the substance of the interaction and cooperation of players involved (states, international organizations and other actors). Game theory provides a basis for normative analysis of the issue of implementation of the rules of international law and improves understanding of those rules. The topic of the paper is the application of the game theory in the context of the legal framework established by the World Trade Organization. The member states' dilemma between using the advantages and liberalization options provided by the WTO on the one hand, and joining the regional trade agreements, on the other one, is strategic by nature. Therefore, game theory can contribute to understanding and resolving, using the game of 'prisoner's dilemma' as a model. It is the game which clearly shows that a group of rational egoists can end up worse than a group of actors that acts prima facie contrary to their own interests. 'Prisoner's dilemma' demonstrates why society and law has the need for coordination as well as mechanisms for co-operation. WTO member states put emphasis on the process of liberalization conducted in the framework of regional trade agreements (RTAs); at the same time, their participation in WTO negotiations is not effective and efficient enough to make a breakthrough in the multilateral framework. A solution of the game for Member States is not to cooperate: i. e, liberalization is primarily achieved through regional agreements rather than within the WTO. The rational decision of the Member States (opting for a regional approach) has resulted in a suboptimal result, which is a basic characteristic of the game model based on a prisoner's dilemma: in this case, the optimal solution would be cooperation through a multilateral framework (World Trade Organization).

The internationalization of national constitutions includes an eventual unification of constitutional rules deemed necessary to intensify international relations. So, in a broader way it is invoked the impact of international law and international relations on constitutional law. The result of the internationalization of national rights is a progressive harmonization of concepts and legal rules. In the current state of international law, constitutions' internationalization corresponds a concrete impact of international law on constitutional norms. The current trend of constitutions is to regulate in a more accurate and comprehensive way the relations between the state and international law. International law does not require any particular form of the conclusion of international treaties. In intensification of international relations, international conventions and integration of states in international organizations, the Parliament carries important consequences for both on normative function and the control function. Such legislative activity is guided by international treaties concluded by the state. While the executive and the legislative are involved in the development of international law, the jurisdictional power intervenes to reconcile domestic and international legal norms. States do not devote supremacy of international law over their constitution. Because international treaties to be part of the national legal order is not enough that the procedure for concluding treaties to be respected. It is also necessary that treaties do not contravene fundamental state constitutional principles of human rights and the relationship between public authorities. The control of international treaties' constitutionality can be mandatory or optional. In the process of ratification of the treaty on EU European constitutional courts tend to create a similar design to establish the limits of European integration. In reality, the issue of constitutionality of international treaties control is a political issue and it is difficult to apply legal principles purely political matters. There are three categories of states in the aspect of national courts on constitutional regularity control concluding treaties.

Development perspectives of the European Law of Contracts arise from the Press Releases of the European Parliament, the Union Council and the European Commission. The necessity to develop the European Law of Contracts is determined by the objectives of the Common Market, by the amplification of the commercial relations inside the EU, by the abstract and selective regulation of the contracts in the Treaty on European Union, in the EU Regulations and Directives, as well as by the divergences of contracts in national legislations of Member States.

Such famous jurists as H. Kelsen, J. Chevallier, Giorgio del Vecchio, A. Hauriou, Mircea Djuvara, François Rigaux, Ion Deleanu, Tudor Drăganu etc. expressed their views on the principles of the rule of law, which persisted for several centuries. The rule of law is never a perfect reality and no country can claim to have achieved perfection, because the rule of law is not obtained easily, it is the joint effort of the state authorities, civil society, and all the citizens. José Manuel Durão Barroso stated that "The rule of law is the cornerstone of the European Union, there is no true democracy without the rule of law and without democracy the rule of law is just an instrument in the hand of the rulers". While the European Commissioner for Justice, Viviane Reding stated that "In parallel to the economic and financial crisis, we also have been confronted on several occasions with a true "rule of law" crisis. At the beginning of April 2014, in Innsbruck (Austria), was held the academic conference entitled "Strengthening the rule of law in Europe - from a common concept to mechanisms of implementation". On April 21, 2014, the European Parliament noted, according to Article 49 of the EU Treaty, Moldova, Ukraine and Georgia, as any European country can apply to become a member of the European Union, given that they realize the principles of democracy, the fundamentals of freedom, human and minority rights and ensure the rule of law. Thus, achieving the rule of law in Moldova was and will be a permanent and current task in the coming years.

The article contains a peer analysis of European primary legislation concerning enhanced cooperation within the European Union between the member states in accordance with their will on agreed issues. The research includes the forms of enhanced cooperation, the procedure of enhanced cooperation, the spheres of its application, the instruments of enhanced cooperation and the legal effects of enhanced cooperation both for participating and third countries.