A publication of the Organization for Economic Co-operation and Development, a group of 36 high-income countries, notes, “The traditional view of international trade is that each country produces finished products that are then exported to consumers in another country. This type of trade, however, represents only 30% of total trade in goods and services.” 

a. What accounts for the other 70 percent of world trade? 

b. What implications does your answer to part (a) have for the way in which governments around the world typically compile statistics on imports and exports? 

c. What difficulties might problems with trade statistics cause for government policymakers?