<Li> War <Ul> <Li> Currency </Li> <Li> Trade costs </Li> <Li> Customs </Li> <Li> Trade </Li> </Ul> </Li> <Ul> <Li> Currency </Li> <Li> Trade costs </Li> <Li> Customs </Li> <Li> Trade </Li> </Ul> <Li> Trade and development </Li> <Tr> <Td> Lists (show) <Ul> <Li> Imports </Li> <Li> Exports </Li> <Li> Tariffs </Li> <Li> Largest consumer markets </Li> <Li> Leading trade partners </Li> </Ul> </Td> </Tr>

5 bases for the existence of international trade