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 in miscellaneous ways. Not only is this popular 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 different commodities that are important for us to develop, on our own. This can be also found out in case of economies, which also lack of some resources and, consequently import them from other countries.