Answer:
International business encompasses all commercial activities that take place to promote the transfer of goods, services, resources, people, ideas, and technologies across national borders. ... International trade is the exchange of capital, goods, and services across international borders or territories.
They use homologous structures as base of classification
Here you go :
http://www.institutions-africa.org/trackingdevelopment_archived/resources/docs/TD%20in%20SA%20and%20SSA_The%20primacy%20of%20policy.pdf
