People have always exchanged goods or services between each other. It is proved 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 needs to love and be loved, but also it is related to the fact that we are unable to distribute everything beginning from food and ending on miscellaneous commodities that are important for us to develop, on our own. This can be also observed in case of economies, which also lack of some resources and, hence import them from other countries.