Demurrage currency is a type of money that is designed to gradually depreciate in value at a flat constant rate.A demurrage monetary system works similarly to a fiat monetary system, but there are major differences in how money is borrowed, lent, and created.

Under the stamp scrip system proposed by Silvio Gesell, every bill of paper money had a set of 52 printed boxes (4 x 13), and a stamp worth 0.1% of the bill's face value would have to be purchased and stamped