Japan bans importation of rice to protect its domestic rice industry. this ban is an example of: protectionism.
This is the economic term that is used to refer to a trade barrier that may come in place in a given country. This would involve having to ban the importation of a particular product from the people of other nations in other to develop their own market.
This is a good way of having a nation to grow its own sector. Hence when Japan banned the importation of rice, what they expect was for the people to buy the product from the local rice farmers in the country.
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