Foreign trade, also known as “international trade” or “import and export trade”, refers to the exchange of goods and services between one country (region) and another. This trade consists of two parts: import and export. For the country (region) that imports goods or services, it is called import; for the country (region) that exports goods or services, it is called export. This phenomenon emerged and developed in slave societies and feudal societies, and became even more rapid in capitalist societies. Its nature and function are determined by different social systems.Befor…