Planet Money had an episode about that recently. https://www.npr.org/sections/money/2015/10/14/448718171/episode-657-the-tale-of-the-onion-king https://www.npr

Planet Money had an episode about that recently. https://www.npr.org/sections/money/2015/10/14/448718171/episode-657-the-tale-of-the-onion-king https://www.npr.org/sections/money/2015/10/14/448718171/epis...