From the theoretical perspective it is important to mention that, first of all, the scientific nature of the foreign economic activity means the development of this activity in accordance with objective economic laws. Practically according to this principle, management of international business transactions involves the organization of demand and supply of its products abroad, the price level, and the ratio to costs in the exporting country. One of the main problems of management of foreign economic activity is miscalculations - the knowledge of managers of enterprises of existing theories of international trade helps them to avoid a significant part of miscalculations, and additionally, it helps reasonably predict changes in international markets. We can, also, mention that this principle is especially important in the implementation of international financial calculations, which must be based on changes in exchange rates.
