The biggest disadvantage is that when one country imposes trade barriers on another country the other country retaliates by imposing barriers on the 1st country.

Human Needs are the basic requirements of a human being that have to be fulfilled to live on this earth (example: Air, Water, Food, Clothes, Shelter,etc...). Human wants are the alternative ways of satisfying human Needs. Example: Food- Pizza, Rice Clothes- Jacket, Jeans Shelter- Villa, Bungalow