One of the most important results of theoretical research on currency systems is that spacing denominations apart by a factor of two is better than a factor of three as this lowers the average number of notes and coins exchanged in transactions. These theoretical studies also claim that an...

In recent years, numerous central banks throughout the world have introduced plastic banknotes in order to combat counterfeiting and reduce their operating costs. In this paper, we provide an analytical framework that allows central banks to assess whether changing the manufacturing material of...