First published by Money Metals here: https://www.moneymetals.com/news/2016/09/19/20-dollar-bill-ban-000926

Harvard professor and economist Ken Rogoff is once again leading the chorus of high-level academics and officials who declare cash is only for criminals. He made his case in a recent Wall Street Journal editorial called the “Sinister Side of Cash.” Our benevolent central planners can largely incapacitate them by ridding society of anything larger than a $10 bill.