Some American economists have proposed doing something similar for large dollar bills: http://www.wsj.com/articles/the-sinister-side-of-cash-1472137692 http://

Some American economists have proposed doing something similar for large dollar bills: http://www.wsj.com/articles/the-sinister-side-of-cash-1472137692 http://www.wsj.com/articles/the-sinister-side-of-cash-147213...