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 related to the fact that we are unable to produce everything starting from food and ending on different commodities that are needed for us to develop, on our own. This can be also discovered in case of economies, which also lack of some resources and, hence import them from other countries.