People have always exchanged products or services between each other. It is indicated by the fact that almost nobody can live without other people and this can be understood differently. Not only is this important in psychological sense as a result of the fact that everyone doesn’t want to be alone and requires to love and be loved, but also it is connected with the fact that we are unable to develop everything beginning from food and ending on different goods that are required for us to develop, on our own. This might be also recognized in case of economies, which also lack of some resources and, as a result import them from other countries.