Their efficacy may not have been scientifically tested to the same degree as the drugs listed in the table above. However there may be historical, cultural or anecdotal evidence linking their use to the treatment of Anxiety and Stress.
During the Great Leap Forward, farming was organized into communes and the cultivation of private plots forbidden. Iron and steel production was identified as a key requirement for economic advancement. Millions of peasants were ordered away from agricultural work to join the iron and steel production workforce.
Even a country that is more efficient (has absolute advantage) in everything it makes would benefit from trade. Country A: One hour of labor can produce either three kilograms of steel or two shirts. Country B: One hour of labor can produce either one kilogram of steel or one shirt.