Production of items with different costs, because there are differences in the quantity and resources, that is, some countries have more minerals. In some countries, there are more forests in some countries oil sources.
Production costs differ because. There are differences in the amount of resources that is, some countries have minerals. Some of the country's oil resources Some countries have more forest
Production costs are different because There are differences in the quantity and the resources, that is, some countries have minerals. Some countries as a source of oil. Some countries have forest.