http://www.slate.com/articles/business/the_bills/2015/10/trump_carson_bush_all_benefited_from_multilevel_marketing_schemes.html

Much has been made of the fact that the two leading contenders in the Republican presidential primary, Donald Trump and Ben Carson, lack any experience in elected office. Much less attention has gone to something else the two men share: a history of entanglements with companies that have been rightly criticized for hawking get-rich-quick schemes to the broke and desperate. The business model, which is perfectly legal, is called multilevel marketing.