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The article investigates the formal models as a method of analysis in international studies. The importance of this type of models in writing articles for world leading high-ranking journals from Scopus list is shown. The author reveals the main challenges of interdisciplinary synthesis related to the construction of formal models. The problem of identifying the actors of international relations is revealed, including the assessment of actor's involvement in a concrete international conflict (or process) in the context of the concepts of defensive and offensive realism, as well as of real and of latent (potential) power. The decrease in the influence of the state as the primary actor in international relations, and the increase of influence of new types of actors are shown, including international terrorist networks (led by IS), political parties, media and NGOs in the context of post-modernism, global business structures. At the national level, the main actors are illustrated both by the example of countries with a developed civil society and a market economy, and by that of the traditional non-Western society. The question of levels of analysis in international relations, as well as agent-structure problem are illustrated by concrete cases from modern international relations. The author describes a model of "nested" politics. The main types of models used in international studies (game theoretic, econometric, network analysis, simulation) are indicated as well as their shortcomings. Two kinds of simulation models - system dynamics and agent-based modeling are described. It is noted that the agent-based modeling is carried out mainly in the framework of the constructivist paradigm of international relations theory.

The aim of the research is to analyze the role of the consumer in a detailed way. Firstly I defined the concepts of "consumption" and "consumer", giving relief to the socio-economic theories that have characterized the subject during recent years,and taking in consideration the process of consumption and the behavioral and decisional theories proper of the consumer. Moreover, I have deeply analyzed the consumer under the juridical aspect, from the mere legal recognition to the trial and the efforts sustained by the European Legislator during the last years with the purpose of creating a system of common rules with the final goal of guaranteeing a high-level of protection to the consumer in international contracts and assuring the correct operation of the Single Internal Market founding the discipline on a competitive model. Great relief is given to the "Rome I Regulation" on the choice of the law aplicable to contracts and to the "Bruxelles Convention" on the competent court.