Trade between Japan and the U.S. Primary products are commodities like scrap metal, hardwood, and soybeans that have not undergone a great deal of processing. They are the types of products that colonies once exported to their mother countries, and the types of commodities that the United States sells to Japan.
Secondary goods are manufactures like electronics equipment, automobiles, and cameras.
They are the types of products that colonies once imported from their mother country, and are the sorts of things that the United States buys from Japanese companies.