International trade is defined as the exchange of goods and services between parties located in different countries. It has several distinguishing features compared to domestic trade within a country, such as the immobility of production factors across borders, geographical and climatic differences between countries, and differing currency and political systems among trading nations. Managing the balance of payments, or the difference between a country's total imports and exports, is also a unique issue for international trade that does not apply to domestic trade within one country.