Below is a citation that I have posted in another thread. I think the post is more suitable in this thread.
"Japan has an old culture and tradition. Usually, they do not like to trade with foreigners although they will trade with their country. So, how it is done? Usually, Japanese Sogo Sosha (conglomerate, multinational trading houses} companies do the job. They would establish offices in a foreign country, but will shun the local companies and would prefer to buy goods from manufacturing companies owned by other Japanese in that country and would export these to Japan.
This is how the Japanese maintain quality and timely delivery. Japanese trust only themselves. The word "Wa" has a deep meaning in the Japanese society. It means harmony, which they find the foreigners neither understand nor appreciate. This is why they would prefer to work among themselves.
The above explanation says that even in a two way trade, almost only the Japanese companies would manufacture, export as well as import. They will only use the local cheap labor. So, unless and until this basic business structure is developed by the Japanese companies in BD, trade between the two countries may not flourish the way the two govts want it to be".