I ran clinics in Ecuador, Colombia, Brazil, Kenya, Uganda etc. all loaded with corruption. In Kenya, president Moi had bank print money to buy votes, was elected with over 99% of the voters, and the next day the currency was devalued 50%. Roads and highways had blocks that would not let you pass without bribes. Problem is that they are armed, and zero note presentation would get you killed very quickly. As long as police and government are corrupt, there is little hope of fighting the system. Perhaps an honest dictator and strong rules for police might help.