There were a couple of interesting Planet Money podcast episodes on this from earlier this year: * part 1: http://www.npr.org/sections/money/2017/05/10/5278037

There were a couple of interesting Planet Money podcast episodes on this from earlier this year: * part 1: http://www.npr.org/sections/money/2017/05/10/527803742/episode-770-when-indias-cash-disappeared-part-one http://www.npr.org/sections/money/2017/05/10/527803742/episo... * part 2: http://www.npr.org/sections/money/2017/05/12/528181998/episode-771-when-indias-cash-disappeared-part-two http://www.npr.org/sections/money/2017/05/12/528181998/episo...