Today, the international dimension of economic activity is a fact of life. International economics" as a discipline has thus become essential to understanding the globalization of trade and the interdependent relationships between different countries. The aim of this textbook is to present the theory of international trade (Part I), international trade policies (Part II) and international monetary and financial problems (Part III). It is aimed at students in higher education, those at the grandes écoles and all those who wish to understand the nature and effects of contemporary international economic relations.