Why a Stamp Scrip?

John Maynard Keynes specifically states: "Those reformers, who look for a remedy by creating an artificial carrying cost for money through the device of requiring legal-tender currency to be periodically stamped at a prescribed cost in order to retain its quality as money, have been on the right track, and the practical value of their proposal deserves consideration. (note 5)  

Sec. 6: https://www.transaction.net/money/cc/cc03.html#hand

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On the definition of Demurrage:

"Both John Maynard Keynes and Irving Fisher provided theoretical foundation for this approach, and it was implemented in the "stamp scrip" of the 1930's."

 https://www.transaction.net/money/glossary.html#demurrage

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The concept:

During the economic depression of the 1930s, Europe saw a number of practical monetary experiments with negative-interest alternative currency. The device worked splendidly. The alternative currency (typically issued by a small city or region) had many times the rapidity of circulation of the official currency, and the anticipated employment and environmental benefits were actualized. In Worgl, for example, people spontaneously started replanting forests just to dispose of their negative-interest currency in anticipation of future cash flow to be expected from the growing trees. In every case, however, the central bank halted the experiment after a few years. The experiments were blocked not because they were unsuccessful but because they were so remarkably successful that they were perceived as threatening to centralized decision-making and the central bank's monopoly on issuing currency.  

Sec. 1 The Stamp Scrip concept: https://www.transaction.net/money/gc/gc01.html